diff --git a/lib/api.c b/lib/api.c
index 4333573fd..1761b829d 100644
--- a/lib/api.c
+++ b/lib/api.c
@@ -322,7 +322,7 @@ int api_stop(struct api *a)
 		return 0;
 
 	for (int i = 0; i < list_length(&a->sessions); i++) {
-		struct api_session *s = list_at(&a->sessions, i);
+		struct api_session *s = (struct api_session *) list_at(&a->sessions, i);
 
 		s->state = API_SESSION_STATE_SHUTDOWN;
 
diff --git a/lib/api/actions/capabiltities.c b/lib/api/actions/capabiltities.c
index 2e2dbbb7e..5da974c21 100644
--- a/lib/api/actions/capabiltities.c
+++ b/lib/api/actions/capabiltities.c
@@ -31,7 +31,7 @@ static int api_capabilities(struct api_action *h, json_t *args, json_t **resp, s
 	json_t *json_name;
 
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *p = list_at(&plugins, i);
+		struct plugin *p = (struct plugin *) list_at(&plugins, i);
 
 		json_name = json_string(p->name);
 
diff --git a/lib/api/actions/nodes.c b/lib/api/actions/nodes.c
index 0c4a9ea70..4a1a940ac 100644
--- a/lib/api/actions/nodes.c
+++ b/lib/api/actions/nodes.c
@@ -35,7 +35,7 @@ static int api_nodes(struct api_action *r, json_t *args, json_t **resp, struct a
 	json_t *json_nodes = json_array();
 
 	for (size_t i = 0; i < list_length(&s->api->super_node->nodes); i++) {
-		struct node *n = list_at(&s->api->super_node->nodes, i);
+		struct node *n = (struct node *) list_at(&s->api->super_node->nodes, i);
 
 		json_t *json_node = json_pack("{ s: s, s: i, s: i, s: i, s: i }",
 			"name",		node_name_short(n),
diff --git a/lib/api/actions/paths.c b/lib/api/actions/paths.c
index 2633f08bb..0ad270a1f 100644
--- a/lib/api/actions/paths.c
+++ b/lib/api/actions/paths.c
@@ -34,7 +34,7 @@ static int api_paths(struct api_action *r, json_t *args, json_t **resp, struct a
 	json_t *json_paths = json_array();
 
 	for (size_t i = 0; i < list_length(&s->api->super_node->paths); i++) {
-		struct path *p = list_at(&s->api->super_node->paths, i);
+		struct path *p = (struct path *) list_at(&s->api->super_node->paths, i);
 
 		json_t *json_path = json_pack("{ s: i }",
 			"state",	p->state
diff --git a/lib/fpga/card.c b/lib/fpga/card.c
index 88d0b2fe4..c0aa3840d 100644
--- a/lib/fpga/card.c
+++ b/lib/fpga/card.c
@@ -111,7 +111,7 @@ int fpga_card_parse(struct fpga_card *c, json_t *cfg, const char *name)
 		const char *vlnv;
 
 		struct fpga_ip_type *vt;
-		struct fpga_ip *ip = alloc(sizeof(struct fpga_ip));
+		struct fpga_ip *ip = (struct fpga_ip *) alloc(sizeof(struct fpga_ip));
 
 		ip->card = c;
 
@@ -149,7 +149,7 @@ int fpga_card_parse_list(struct list *cards, json_t *cfg)
 	const char *name;
 	json_t *json_fpga;
 	json_object_foreach(cfg, name, json_fpga) {
-		struct fpga_card *c = alloc(sizeof(struct fpga_card));
+		struct fpga_card *c = (struct fpga_card *) alloc(sizeof(struct fpga_card));
 
 		ret = fpga_card_parse(c, json_fpga, name);
 		if (ret)
@@ -203,7 +203,7 @@ int fpga_card_start(struct fpga_card *c)
 
 	/* Initialize IP cores */
 	for (size_t j = 0; j < list_length(&c->ips); j++) {
-		struct fpga_ip *i = list_at(&c->ips, j);
+		struct fpga_ip *i = (struct fpga_ip *) list_at(&c->ips, j);
 
 		ret = fpga_ip_start(i);
 		if (ret)
@@ -222,7 +222,7 @@ int fpga_card_stop(struct fpga_card *c)
 	assert(c->state == STATE_STOPPED);
 
 	for (size_t j = 0; j < list_length(&c->ips); j++) {
-		struct fpga_ip *i = list_at(&c->ips, j);
+		struct fpga_ip *i = (struct fpga_ip *) list_at(&c->ips, j);
 
 		ret = fpga_ip_stop(i);
 		if (ret)
@@ -247,7 +247,7 @@ void fpga_card_dump(struct fpga_card *c)
 
 		info("IP blocks:");
 		for (size_t j = 0; j < list_length(&c->ips); j++) { INDENT
-			struct fpga_ip *i = list_at(&c->ips, j);
+			struct fpga_ip *i = (struct fpga_ip *) list_at(&c->ips, j);
 
 			fpga_ip_dump(i);
 		}
diff --git a/lib/fpga/ip.c b/lib/fpga/ip.c
index de83738ef..86841db12 100644
--- a/lib/fpga/ip.c
+++ b/lib/fpga/ip.c
@@ -157,7 +157,7 @@ struct fpga_ip_type * fpga_ip_type_lookup(const char *vstr)
 
 	/* Try to find matching IP type */
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *p = list_at(&plugins, i);
+		struct plugin *p = (struct plugin *) list_at(&plugins, i);
 
 		if (p->type == PLUGIN_TYPE_FPGA_IP && !fpga_vlnv_cmp(&vlnv, &p->ip.vlnv))
 			return &p->ip;
diff --git a/lib/fpga/ips/dft.c b/lib/fpga/ips/dft.c
index a17c55006..b64d346af 100644
--- a/lib/fpga/ips/dft.c
+++ b/lib/fpga/ips/dft.c
@@ -15,7 +15,7 @@
 
 int dft_parse(struct fpga_ip *c, json_t *cfg)
 {
-	struct dft *dft = c->_vd;
+	struct dft *dft = (struct dft *) c->_vd;
 
 	int ret;
 
@@ -56,7 +56,7 @@ int dft_start(struct fpga_ip *c)
 	int ret;
 
 	struct fpga_card *f = c->card;
-	struct dft *dft = c->_vd;
+	struct dft *dft = (struct dft *) c->_vd;
 
 	XHls_dft *xdft = &dft->inst;
 	XHls_dft_Config xdft_cfg = {
@@ -86,7 +86,7 @@ int dft_start(struct fpga_ip *c)
 
 int dft_stop(struct fpga_ip *c)
 {
-	struct dft *dft = c->_vd;
+	struct dft *dft = (struct dft *) c->_vd;
 
 	XHls_dft *xdft = &dft->inst;
 
@@ -97,7 +97,7 @@ int dft_stop(struct fpga_ip *c)
 
 int dft_destroy(struct fpga_ip *c)
 {
-	struct dft *dft = c->_vd;
+	struct dft *dft = (struct dft *) c->_vd;
 
 	if (dft->fharmonics) {
 		free(dft->fharmonics);
diff --git a/lib/fpga/ips/dma.c b/lib/fpga/ips/dma.c
index 7bb23acd3..5384f98fa 100644
--- a/lib/fpga/ips/dma.c
+++ b/lib/fpga/ips/dma.c
@@ -100,7 +100,7 @@ int dma_ping_pong(struct fpga_ip *c, char *src, char *dst, size_t len)
 
 int dma_write(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 
@@ -113,7 +113,7 @@ int dma_write(struct fpga_ip *c, char *buf, size_t len)
 
 int dma_read(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 
@@ -126,7 +126,7 @@ int dma_read(struct fpga_ip *c, char *buf, size_t len)
 
 int dma_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 
@@ -139,7 +139,7 @@ int dma_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 
 int dma_write_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 
@@ -154,7 +154,7 @@ int dma_sg_write(struct fpga_ip *c, char *buf, size_t len)
 {
 	int ret, bdcnt;
 
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetTxRing(xdma);
@@ -231,7 +231,7 @@ int dma_sg_read(struct fpga_ip *c, char *buf, size_t len)
 {
 	int ret, bdcnt;
 
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetRxRing(xdma);
@@ -299,7 +299,7 @@ out:
 
 int dma_sg_write_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetTxRing(xdma);
@@ -330,7 +330,7 @@ int dma_sg_write_complete(struct fpga_ip *c, char **buf, size_t *len)
 
 int dma_sg_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetRxRing(xdma);
@@ -384,7 +384,7 @@ int dma_sg_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 
 int dma_simple_read(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetRxRing(xdma);
@@ -422,7 +422,7 @@ int dma_simple_read(struct fpga_ip *c, char *buf, size_t len)
 
 int dma_simple_write(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetTxRing(xdma);
@@ -461,7 +461,7 @@ int dma_simple_write(struct fpga_ip *c, char *buf, size_t len)
 
 int dma_simple_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetRxRing(xdma);
@@ -484,7 +484,7 @@ int dma_simple_read_complete(struct fpga_ip *c, char **buf, size_t *len)
 
 int dma_simple_write_complete(struct fpga_ip *c, char **buf, size_t *len)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 	XAxiDma_BdRing *ring = XAxiDma_GetTxRing(xdma);
@@ -563,7 +563,7 @@ static int dma_init_rings(XAxiDma *xdma, struct dma_mem *bd)
 int dma_start(struct fpga_ip *c)
 {
 	int ret, sg;
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma *xdma = &dma->inst;
 
@@ -618,7 +618,7 @@ int dma_start(struct fpga_ip *c)
 
 int dma_reset(struct fpga_ip *c)
 {
-	struct dma *dma = c->_vd;
+	struct dma *dma = (struct dma *) c->_vd;
 
 	XAxiDma_Reset(&dma->inst);
 
diff --git a/lib/fpga/ips/fifo.c b/lib/fpga/ips/fifo.c
index efe387e2f..b57a3ecc9 100644
--- a/lib/fpga/ips/fifo.c
+++ b/lib/fpga/ips/fifo.c
@@ -21,7 +21,7 @@ int fifo_start(struct fpga_ip *c)
 	int ret;
 
 	struct fpga_card *f = c->card;
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	XLlFifo *xfifo = &fifo->inst;
 	XLlFifo_Config fifo_cfg = {
@@ -41,7 +41,7 @@ int fifo_start(struct fpga_ip *c)
 
 int fifo_stop(struct fpga_ip *c)
 {
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	XLlFifo *xfifo = &fifo->inst;
 
@@ -52,7 +52,7 @@ int fifo_stop(struct fpga_ip *c)
 
 ssize_t fifo_write(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	XLlFifo *xllfifo = &fifo->inst;
 
@@ -70,7 +70,7 @@ ssize_t fifo_write(struct fpga_ip *c, char *buf, size_t len)
 
 ssize_t fifo_read(struct fpga_ip *c, char *buf, size_t len)
 {
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	XLlFifo *xllfifo = &fifo->inst;
 
@@ -93,7 +93,7 @@ ssize_t fifo_read(struct fpga_ip *c, char *buf, size_t len)
 
 int fifo_parse(struct fpga_ip *c, json_t *cfg)
 {
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	int baseaddr_axi4 = -1, ret;
 
@@ -112,7 +112,7 @@ int fifo_parse(struct fpga_ip *c, json_t *cfg)
 
 int fifo_reset(struct fpga_ip *c)
 {
-	struct fifo *fifo = c->_vd;
+	struct fifo *fifo = (struct fifo *) c->_vd;
 
 	XLlFifo_Reset(&fifo->inst);
 
diff --git a/lib/fpga/ips/intc.c b/lib/fpga/ips/intc.c
index 51e2abb88..1a6d1356a 100644
--- a/lib/fpga/ips/intc.c
+++ b/lib/fpga/ips/intc.c
@@ -24,7 +24,7 @@ int intc_start(struct fpga_ip *c)
 	int ret;
 
 	struct fpga_card *f = c->card;
-	struct intc *intc = c->_vd;
+	struct intc *intc = (struct intc *) c->_vd;
 
 	uintptr_t base = (uintptr_t) f->map + c->baseaddr;
 
@@ -64,7 +64,7 @@ int intc_start(struct fpga_ip *c)
 int intc_destroy(struct fpga_ip *c)
 {
 	struct fpga_card *f = c->card;
-	struct intc *intc = c->_vd;
+	struct intc *intc = (struct intc *) c->_vd;
 
 	vfio_pci_msi_deinit(&f->vfio_device, intc->efds);
 
@@ -74,7 +74,7 @@ int intc_destroy(struct fpga_ip *c)
 int intc_enable(struct fpga_ip *c, uint32_t mask, int flags)
 {
 	struct fpga_card *f = c->card;
-	struct intc *intc = c->_vd;
+	struct intc *intc = (struct intc *) c->_vd;
 
 	uint32_t ier, imr;
 	uintptr_t base = (uintptr_t) f->map + c->baseaddr;
@@ -124,7 +124,7 @@ int intc_disable(struct fpga_ip *c, uint32_t mask)
 uint64_t intc_wait(struct fpga_ip *c, int irq)
 {
 	struct fpga_card *f = c->card;
-	struct intc *intc = c->_vd;
+	struct intc *intc = (struct intc *) c->_vd;
 
 	uintptr_t base = (uintptr_t) f->map + c->baseaddr;
 
diff --git a/lib/fpga/ips/model.c b/lib/fpga/ips/model.c
index d8935db75..d795e050f 100644
--- a/lib/fpga/ips/model.c
+++ b/lib/fpga/ips/model.c
@@ -64,7 +64,7 @@ static int model_xsg_map_parse(uint32_t *map, size_t len, struct list *parameter
 				if (length < 4)
 					break; /* block is to small to describe a gateway */
 
-				struct model_parameter *e, *p = alloc(sizeof(struct model_parameter));
+				struct model_parameter *e, *p = (struct model_parameter *) alloc(sizeof(struct model_parameter));
 
 				p->name          =  copy_string(3);
 				p->default_value.flt =  *((float *) &data[1]);
@@ -135,7 +135,7 @@ static int model_xsg_map_read(uint32_t *map, size_t len, void *baseaddr)
 
 int model_parse(struct fpga_ip *c, json_t *cfg)
 {
-	struct model *m = c->_vd;
+	struct model *m = (struct model *) c->_vd;
 
 	int ret;
 
@@ -163,7 +163,7 @@ int model_parse(struct fpga_ip *c, json_t *cfg)
 			if (!json_is_real(value))
 				error("Parameters of FPGA IP '%s' must be of type floating point", c->name);
 
-			struct model_parameter *p = alloc(sizeof(struct model_parameter));
+			struct model_parameter *p = (struct model_parameter *) alloc(sizeof(struct model_parameter));
 
 			p->name = strdup(name);
 			p->default_value.flt = json_real_value(value);
@@ -206,7 +206,7 @@ int model_init(struct fpga_ip *c)
 {
 	int ret;
 
-	struct model *m = c->_vd;
+	struct model *m = (struct model *) c->_vd;
 
 	list_init(&m->parameters);
 	list_init(&m->infos);
@@ -218,7 +218,7 @@ int model_init(struct fpga_ip *c)
 
 	/* Set default values for parameters */
 	for (size_t i = 0; i < list_length(&m->parameters); i++) {
-		struct model_parameter *p = list_at(&m->parameters, i);
+		struct model_parameter *p = (struct model_parameter *) list_at(&m->parameters, i);
 
 		p->ip = c;
 
@@ -236,7 +236,7 @@ int model_init(struct fpga_ip *c)
 
 int model_destroy(struct fpga_ip *c)
 {
-	struct model *m = c->_vd;
+	struct model *m = (struct model *) c->_vd;
 
 	list_destroy(&m->parameters, (dtor_cb_t) model_parameter_destroy, true);
 	list_destroy(&m->infos, (dtor_cb_t) model_info_destroy, true);
@@ -249,7 +249,7 @@ int model_destroy(struct fpga_ip *c)
 
 void model_dump(struct fpga_ip *c)
 {
-	struct model *m = c->_vd;
+	struct model *m = (struct model *) c->_vd;
 
 	const char *param_type[] = { "UFix", "Fix", "Float", "Boolean" };
 	const char *parameter_dirs[] = { "In", "Out", "In/Out" };
@@ -257,7 +257,7 @@ void model_dump(struct fpga_ip *c)
 	{ INDENT
 		info("Parameters:");
 		for (size_t i = 0; i < list_length(&m->parameters); i++) { INDENT
-			struct model_parameter *p = list_at(&m->parameters, i);
+			struct model_parameter *p = (struct model_parameter *) list_at(&m->parameters, i);
 
 			if (p->direction == MODEL_PARAMETER_IN)
 				info("%#jx: %s (%s) = %.3f %s %u",
@@ -278,7 +278,7 @@ void model_dump(struct fpga_ip *c)
 
 		info("Infos:");
 		for (size_t j = 0; j < list_length(&m->infos); j++) { INDENT
-			struct model_info *i = list_at(&m->infos, j);
+			struct model_info *i = (struct model_info *) list_at(&m->infos, j);
 
 			info("%s: %s", i->field, i->value);
 		}
@@ -340,8 +340,8 @@ int model_parameter_write(struct model_parameter *p, double v)
 
 void model_parameter_add(struct fpga_ip *c, const char *name, enum model_parameter_direction dir, enum model_parameter_type type)
 {
-	struct model *m = c->_vd;
-	struct model_parameter *p = alloc(sizeof(struct model_parameter));
+	struct model *m = (struct model *) c->_vd;
+	struct model_parameter *p = (struct model_parameter *) alloc(sizeof(struct model_parameter));
 
 	p->name = strdup(name);
 	p->type = type;
@@ -352,7 +352,7 @@ void model_parameter_add(struct fpga_ip *c, const char *name, enum model_paramet
 
 int model_parameter_remove(struct fpga_ip *c, const char *name)
 {
-	struct model *m = c->_vd;
+	struct model *m = (struct model *) c->_vd;
 	struct model_parameter *p;
 
 	p = list_lookup(&m->parameters, name);
diff --git a/lib/fpga/ips/switch.c b/lib/fpga/ips/switch.c
index 713fa6292..261832062 100644
--- a/lib/fpga/ips/switch.c
+++ b/lib/fpga/ips/switch.c
@@ -20,7 +20,7 @@ int switch_start(struct fpga_ip *c)
 	int ret;
 
 	struct fpga_card *f = c->card;
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 
 	XAxis_Switch *xsw = &sw->inst;
 
@@ -52,7 +52,7 @@ int switch_start(struct fpga_ip *c)
 int switch_init_paths(struct fpga_ip *c)
 {
 	int ret;
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 
 	XAxis_Switch *xsw = &sw->inst;
 
@@ -60,7 +60,7 @@ int switch_init_paths(struct fpga_ip *c)
 	XAxisScr_MiPortDisableAll(xsw);
 
 	for (size_t i = 0; i < list_length(&sw->paths); i++) {
-		struct sw_path *p = list_at(&sw->paths, i);
+		struct sw_path *p = (struct sw_path *) list_at(&sw->paths, i);
 		struct fpga_ip *mi, *si;
 
 		mi = list_lookup(&c->card->ips, p->out);
@@ -81,7 +81,7 @@ int switch_init_paths(struct fpga_ip *c)
 
 int switch_destroy(struct fpga_ip *c)
 {
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 
 	list_destroy(&sw->paths, NULL, true);
 
@@ -90,7 +90,7 @@ int switch_destroy(struct fpga_ip *c)
 
 int switch_parse(struct fpga_ip *c, json_t *cfg)
 {
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 
 	int ret;
 	size_t index;
@@ -113,7 +113,7 @@ int switch_parse(struct fpga_ip *c, json_t *cfg)
 		error("Setting 'paths' of FPGA IP '%s' should be an array of JSON objects", c->name);
 
 	json_array_foreach(json_paths, index, json_path) {
-		struct sw_path *p = alloc(sizeof(struct sw_path));
+		struct sw_path *p = (struct sw_path *) alloc(sizeof(struct sw_path));
 		int reverse = 0;
 
 		ret = json_unpack_ex(json_path, &err, 0, "{ s?: b, s: s, s: s }",
@@ -141,7 +141,7 @@ int switch_parse(struct fpga_ip *c, json_t *cfg)
 
 int switch_connect(struct fpga_ip *c, struct fpga_ip *mi, struct fpga_ip *si)
 {
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 	XAxis_Switch *xsw = &sw->inst;
 
 	uint32_t mux, port;
@@ -177,7 +177,7 @@ int switch_connect(struct fpga_ip *c, struct fpga_ip *mi, struct fpga_ip *si)
 
 int switch_disconnect(struct fpga_ip *c, struct fpga_ip *mi, struct fpga_ip *si)
 {
-	struct sw *sw = c->_vd;
+	struct sw *sw = (struct sw *) c->_vd;
 	XAxis_Switch *xsw = &sw->inst;
 
 	if (!XAxisScr_IsMiPortEnabled(xsw, mi->port, si->port))
diff --git a/lib/fpga/ips/timer.c b/lib/fpga/ips/timer.c
index 9b4e6148f..b45e89c78 100644
--- a/lib/fpga/ips/timer.c
+++ b/lib/fpga/ips/timer.c
@@ -17,7 +17,7 @@
 int timer_start(struct fpga_ip *c)
 {
 	struct fpga_card *f = c->card;
-	struct timer *tmr = c->_vd;
+	struct timer *tmr = (struct timer *) c->_vd;
 
 	XTmrCtr *xtmr = &tmr->inst;
 	XTmrCtr_Config xtmr_cfg = {
diff --git a/lib/hook.c b/lib/hook.c
index 016885d41..fc49bced6 100644
--- a/lib/hook.c
+++ b/lib/hook.c
@@ -205,7 +205,7 @@ static int hook_run_list(struct list *hs, struct sample *smps[], unsigned cnt, i
 	unsigned ret;
 
 	for (size_t i = 0; i < list_length(hs); i++) {
-		struct hook *h = list_at(hs, i);
+		struct hook *h = (struct hook *) list_at(hs, i);
 
 		ret = func(h, smps, &cnt);
 		if (ret || !cnt)
@@ -261,7 +261,7 @@ int hook_parse_list(struct list *list, json_t *cfg, struct path *o, struct node
 		if (!p)
 			jerror(&err, "Unkown hook type '%s'", type);
 
-		struct hook *h = alloc(sizeof(struct hook));
+		struct hook *h = (struct hook *) alloc(sizeof(struct hook));
 
 		ret = hook_init(h, &p->hook, o, n);
 		if (ret)
diff --git a/lib/hooks/convert.c b/lib/hooks/convert.c
index dbf57d095..c54524544 100644
--- a/lib/hooks/convert.c
+++ b/lib/hooks/convert.c
@@ -41,7 +41,7 @@ struct convert {
 
 static int convert_init(struct hook *h)
 {
-	struct convert *p = h->_vd;
+	struct convert *p = (struct convert *) h->_vd;
 
 	p->scale = 1;
 	p->mask = -1;
@@ -51,7 +51,7 @@ static int convert_init(struct hook *h)
 
 static int convert_parse(struct hook *h, json_t *cfg)
 {
-	struct convert *p = h->_vd;
+	struct convert *p = (struct convert *) h->_vd;
 
 	int ret;
 	json_error_t err;
@@ -77,7 +77,7 @@ static int convert_parse(struct hook *h, json_t *cfg)
 
 static int convert_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct convert *p = h->_vd;
+	struct convert *p = (struct convert *) h->_vd;
 
 	for (int i = 0; i < *cnt; i++) {
 		for (int k = 0; k < smps[i]->length; k++) {
diff --git a/lib/hooks/decimate.c b/lib/hooks/decimate.c
index 462d775b9..f20622bd9 100644
--- a/lib/hooks/decimate.c
+++ b/lib/hooks/decimate.c
@@ -34,7 +34,7 @@ struct decimate {
 
 static int decimate_init(struct hook *h)
 {
-	struct decimate *p = h->_vd;
+	struct decimate *p = (struct decimate *) h->_vd;
 
 	p->counter = 0;
 
@@ -43,7 +43,7 @@ static int decimate_init(struct hook *h)
 
 static int decimate_parse(struct hook *h, json_t *cfg)
 {
-	struct decimate *p = h->_vd;
+	struct decimate *p = (struct decimate *) h->_vd;
 
 	int ret;
 	json_error_t err;
@@ -59,7 +59,7 @@ static int decimate_parse(struct hook *h, json_t *cfg)
 
 static int decimate_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct decimate *p = h->_vd;
+	struct decimate *p = (struct decimate *) h->_vd;
 
 	int i, ok;
 	for (i = 0, ok = 0; i < *cnt; i++) {
diff --git a/lib/hooks/drop.c b/lib/hooks/drop.c
index 44e236fc9..4f21106e2 100644
--- a/lib/hooks/drop.c
+++ b/lib/hooks/drop.c
@@ -36,7 +36,7 @@ struct drop {
 
 static int drop_start(struct hook *h)
 {
-	struct drop *d = h->_vd;
+	struct drop *d = (struct drop *) h->_vd;
 
 	d->prev = NULL;
 
@@ -45,7 +45,7 @@ static int drop_start(struct hook *h)
 
 static int drop_stop(struct hook *h)
 {
-	struct drop *d = h->_vd;
+	struct drop *d = (struct drop *) h->_vd;
 
 	if (d->prev)
 		sample_put(d->prev);
@@ -57,7 +57,7 @@ static int drop_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
 	int i, ok, dist;
 
-	struct drop *d = h->_vd;
+	struct drop *d = (struct drop *) h->_vd;
 	struct sample *prev, *cur = NULL;
 
 	for (i = 0, ok = 0, prev = d->prev; i < *cnt; i++, prev = cur) {
@@ -104,7 +104,7 @@ ok:		/* To discard the first X samples in 'smps[]' we must
 
 static int drop_restart(struct hook *h)
 {
-	struct drop *d = h->_vd;
+	struct drop *d = (struct drop *) h->_vd;
 
 	if (d->prev) {
 		sample_put(d->prev);
diff --git a/lib/hooks/jitter_calc.c b/lib/hooks/jitter_calc.c
index 8479c7963..24375ec59 100644
--- a/lib/hooks/jitter_calc.c
+++ b/lib/hooks/jitter_calc.c
@@ -45,7 +45,7 @@ struct jitter_calc {
 
 int jitter_calc_init(struct hook *h)
 {
-	struct jitter_calc *j = h->_vd;
+	struct jitter_calc *j = (struct jitter_calc *) h->_vd;
 
 	size_t sz = GPS_NTP_DELAY_WIN_SIZE * sizeof(int64_t);
 
@@ -68,7 +68,7 @@ int jitter_calc_init(struct hook *h)
 
 int jitter_calc_deinit(struct hook *h)
 {
-	struct jitter_calc *j = h->_vd;
+	struct jitter_calc *j = (struct jitter_calc *) h->_vd;
 
 	free(j->jitter_val);
 	free(j->delay_series);
@@ -88,7 +88,7 @@ int jitter_calc_deinit(struct hook *h)
  */
 int jitter_calc_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct jitter_calc *j = h->_vd;
+	struct jitter_calc *j = (struct jitter_calc *) h->_vd;
 
 	struct timespec now = time_now();
 	int64_t delay_sec, delay_nsec, curr_delay_us;
diff --git a/lib/hooks/map.c b/lib/hooks/map.c
index 1e9ea0512..4d997b7f8 100644
--- a/lib/hooks/map.c
+++ b/lib/hooks/map.c
@@ -40,7 +40,7 @@ struct map {
 
 static int map_init(struct hook *h)
 {
-	struct map *m = h->_vd;
+	struct map *m = (struct map *) h->_vd;
 
 	m->stats = NULL; /** @todo */
 
@@ -49,7 +49,7 @@ static int map_init(struct hook *h)
 
 static int map_destroy(struct hook *h)
 {
-	struct map *m = h->_vd;
+	struct map *m = (struct map *) h->_vd;
 
 	return list_destroy(&m->mapping, NULL, true);
 }
@@ -57,7 +57,7 @@ static int map_destroy(struct hook *h)
 static int map_parse(struct hook *h, json_t *cfg)
 {
 	int ret;
-	struct map *m = h->_vd;
+	struct map *m = (struct map *) h->_vd;
 	json_error_t err;
 	json_t *json_mapping;
 
@@ -77,7 +77,7 @@ static int map_parse(struct hook *h, json_t *cfg)
 static int map_process(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
 	int ret;
-	struct map *m = h->_vd;
+	struct map *m = (struct map *) h->_vd;
 	struct sample *tmp[*cnt];
 	struct pool *p;
 
diff --git a/lib/hooks/print.c b/lib/hooks/print.c
index 29b9dce2b..e12650589 100644
--- a/lib/hooks/print.c
+++ b/lib/hooks/print.c
@@ -38,7 +38,7 @@ struct print {
 
 static int print_init(struct hook *h)
 {
-	struct print *p = h->_vd;
+	struct print *p = (struct print *) h->_vd;
 
 	p->uri = NULL;
 	p->format = io_format_lookup("villas-human");
@@ -48,7 +48,7 @@ static int print_init(struct hook *h)
 
 static int print_start(struct hook *h)
 {
-	struct print *p = h->_vd;
+	struct print *p = (struct print *) h->_vd;
 	int ret;
 
 	ret = io_init(&p->io, p->format, SAMPLE_HAS_ALL);
@@ -64,7 +64,7 @@ static int print_start(struct hook *h)
 
 static int print_stop(struct hook *h)
 {
-	struct print *p = h->_vd;
+	struct print *p = (struct print *) h->_vd;
 	int ret;
 
 	ret = io_close(&p->io);
@@ -80,7 +80,7 @@ static int print_stop(struct hook *h)
 
 static int print_parse(struct hook *h, json_t *cfg)
 {
-	struct print *p = h->_vd;
+	struct print *p = (struct print *) h->_vd;
 	const char *format = NULL;
 	int ret;
 	json_error_t err;
@@ -103,7 +103,7 @@ static int print_parse(struct hook *h, json_t *cfg)
 
 static int print_process(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct print *p = h->_vd;
+	struct print *p = (struct print *) h->_vd;
 
 	io_print(&p->io, smps, *cnt);
 
diff --git a/lib/hooks/restart.c b/lib/hooks/restart.c
index d48ff4a9d..5b72418bf 100644
--- a/lib/hooks/restart.c
+++ b/lib/hooks/restart.c
@@ -35,7 +35,7 @@ struct restart {
 
 static int restart_start(struct hook *h)
 {
-	struct restart *r = h->_vd;
+	struct restart *r = (struct restart *) h->_vd;
 
 	r->prev = NULL;
 
@@ -44,7 +44,7 @@ static int restart_start(struct hook *h)
 
 static int restart_stop(struct hook *h)
 {
-	struct restart *r = h->_vd;
+	struct restart *r = (struct restart *) h->_vd;
 
 	if (r->prev)
 		sample_put(r->prev);
@@ -55,7 +55,7 @@ static int restart_stop(struct hook *h)
 static int restart_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
 	int i;
-	struct restart *r = h->_vd;
+	struct restart *r = (struct restart *) h->_vd;
 	struct sample *prev, *cur = NULL;
 
 	assert(h->node);
@@ -73,7 +73,7 @@ static int restart_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 
 				/* Run restart hooks */
 				for (size_t i = 0; i < list_length(&h->node->hooks); i++) {
-					struct hook *k = list_at(&h->node->hooks, i);
+					struct hook *k = (struct hook *) list_at(&h->node->hooks, i);
 
 					hook_restart(k);
 				}
diff --git a/lib/hooks/shift_seq.c b/lib/hooks/shift_seq.c
index a302d03d0..6833d2052 100644
--- a/lib/hooks/shift_seq.c
+++ b/lib/hooks/shift_seq.c
@@ -34,7 +34,7 @@ struct shift {
 
 static int shift_seq_parse(struct hook *h, json_t *cfg)
 {
-	struct shift *p = h->_vd;
+	struct shift *p = (struct shift *) h->_vd;
 
 	json_error_t err;
 	int ret;
@@ -50,7 +50,7 @@ static int shift_seq_parse(struct hook *h, json_t *cfg)
 
 static int shift_seq_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct shift *p = h->_vd;
+	struct shift *p = (struct shift *) h->_vd;
 
 	for (int i = 0; i < *cnt; i++)
 		smps[i]->sequence += p->offset;
diff --git a/lib/hooks/shift_ts.c b/lib/hooks/shift_ts.c
index 4585669d2..021e14636 100644
--- a/lib/hooks/shift_ts.c
+++ b/lib/hooks/shift_ts.c
@@ -40,7 +40,7 @@ struct shift_ts {
 
 static int shift_ts_init(struct hook *h)
 {
-	struct shift_ts *p = h->_vd;
+	struct shift_ts *p = (struct shift_ts *) h->_vd;
 
 	p->mode = SHIFT_ORIGIN; /* Default mode */
 
@@ -49,7 +49,7 @@ static int shift_ts_init(struct hook *h)
 
 static int shift_ts_parse(struct hook *h, json_t *cfg)
 {
-	struct shift_ts *p = h->_vd;
+	struct shift_ts *p = (struct shift_ts *) h->_vd;
 	double offset;
 	const char *mode = NULL;
 	int ret;
@@ -80,7 +80,7 @@ static int shift_ts_parse(struct hook *h, json_t *cfg)
 
 static int shift_ts_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct shift_ts *p = h->_vd;
+	struct shift_ts *p = (struct shift_ts *) h->_vd;
 
 	for (int i = 0; i < *cnt; i++) {
 		struct sample *s = smps[i];
diff --git a/lib/hooks/skip_first.c b/lib/hooks/skip_first.c
index 6659888aa..c9c39bf56 100644
--- a/lib/hooks/skip_first.c
+++ b/lib/hooks/skip_first.c
@@ -53,7 +53,7 @@ struct skip_first {
 
 static int skip_first_parse(struct hook *h, json_t *cfg)
 {
-	struct skip_first *p = h->_vd;
+	struct skip_first *p = (struct skip_first *) h->_vd;
 
 	double seconds;
 
@@ -82,7 +82,7 @@ static int skip_first_parse(struct hook *h, json_t *cfg)
 
 static int skip_first_restart(struct hook *h)
 {
-	struct skip_first *p = h->_vd;
+	struct skip_first *p = (struct skip_first *) h->_vd;
 
 	p->state = HOOK_SKIP_FIRST_STATE_STARTED;
 
@@ -91,7 +91,7 @@ static int skip_first_restart(struct hook *h)
 
 static int skip_first_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct skip_first *p = h->_vd;
+	struct skip_first *p = (struct skip_first *) h->_vd;
 
 	/* Remember sequence no or timestamp of first sample. */
 	if (p->state == HOOK_SKIP_FIRST_STATE_STARTED) {
diff --git a/lib/hooks/stats.c b/lib/hooks/stats.c
index ec61eac70..449b062de 100644
--- a/lib/hooks/stats.c
+++ b/lib/hooks/stats.c
@@ -48,7 +48,7 @@ struct stats_collect {
 
 static int stats_collect_init(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	/* Register statistic object to path.
 	 *
@@ -67,7 +67,7 @@ static int stats_collect_init(struct hook *h)
 
 static int stats_collect_destroy(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	if (p->uri)
 		free(p->uri);
@@ -77,7 +77,7 @@ static int stats_collect_destroy(struct hook *h)
 
 static int stats_collect_start(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	if (p->uri) {
 		p->output = afopen(p->uri, "w+");
@@ -90,7 +90,7 @@ static int stats_collect_start(struct hook *h)
 
 static int stats_collect_stop(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	stats_print(&p->stats, p->uri ? p->output->file : stdout, p->format, p->verbose);
 
@@ -102,7 +102,7 @@ static int stats_collect_stop(struct hook *h)
 
 static int stats_collect_restart(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	stats_reset(&p->stats);
 
@@ -111,7 +111,7 @@ static int stats_collect_restart(struct hook *h)
 
 static int stats_collect_periodic(struct hook *h)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	stats_print_periodic(&p->stats, p->uri ? p->output->file : stdout, p->format, p->verbose, h->node);
 
@@ -120,7 +120,7 @@ static int stats_collect_periodic(struct hook *h)
 
 static int stats_collect_parse(struct hook *h, json_t *cfg)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	int ret, fmt;
 	json_error_t err;
@@ -154,7 +154,7 @@ static int stats_collect_parse(struct hook *h, json_t *cfg)
 
 static int stats_collect_read(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 	struct stats *s = &p->stats;
 
 	int dist;
@@ -189,7 +189,7 @@ static int stats_collect_read(struct hook *h, struct sample *smps[], unsigned *c
 
 static int stats_collect_write(struct hook *h, struct sample *smps[], unsigned *cnt)
 {
-	struct stats_collect *p = h->_vd;
+	struct stats_collect *p = (struct stats_collect *) h->_vd;
 
 	struct timespec ts_sent = time_now();
 
diff --git a/lib/io/villas_human.c b/lib/io/villas_human.c
index f9b2f65f4..d0f822cba 100644
--- a/lib/io/villas_human.c
+++ b/lib/io/villas_human.c
@@ -235,7 +235,7 @@ int villas_human_fprint(FILE *f, struct sample *smps[], unsigned cnt, int flags)
 
 int villas_human_print(struct io *io, struct sample *smps[], unsigned cnt)
 {
-	struct villas_human *h = io->_vd;
+	struct villas_human *h = (struct villas_human *) io->_vd;
 
 	FILE *f = io->mode == IO_MODE_ADVIO
 			? io->advio.output->file
@@ -268,7 +268,7 @@ int villas_human_fscan(FILE *f, struct sample *smps[], unsigned cnt, int flags)
 
 int villas_human_open(struct io *io, const char *uri)
 {
-	struct villas_human *h = io->_vd;
+	struct villas_human *h = (struct villas_human *) io->_vd;
 	int ret;
 
 	ret = io_stream_open(io, uri);
@@ -282,7 +282,7 @@ int villas_human_open(struct io *io, const char *uri)
 
 void villas_human_rewind(struct io *io)
 {
-	struct villas_human *h = io->_vd;
+	struct villas_human *h = (struct villas_human *) io->_vd;
 
 	h->header_written = false;
 
diff --git a/lib/kernel/if.c b/lib/kernel/if.c
index bce032adc..8e9a33901 100644
--- a/lib/kernel/if.c
+++ b/lib/kernel/if.c
@@ -76,7 +76,7 @@ int if_start(struct interface *i)
 		/* Assign fwmark's to socket nodes which have netem options */
 		int ret, mark = 0;
 		for (size_t j = 0; j < list_length(&i->sockets); j++) {
-			struct socket *s = list_at(&i->sockets, j);
+			struct socket *s = (struct socket *) list_at(&i->sockets, j);
 
 			if (s->tc_qdisc)
 				s->mark = 1 + mark++;
@@ -96,7 +96,7 @@ int if_start(struct interface *i)
 
 		/* Create netem qdisks and appropriate filter per netem node */
 		for (size_t j = 0; j < list_length(&i->sockets); j++) {
-			struct socket *s = list_at(&i->sockets, j);
+			struct socket *s = (struct socket *) list_at(&i->sockets, j);
 
 			if (s->tc_qdisc) {
 				ret = tc_mark(i,  &s->tc_classifier, TC_HANDLE(1, s->mark), s->mark);
diff --git a/lib/kernel/pci.c b/lib/kernel/pci.c
index 3efa25874..b8b8ba287 100644
--- a/lib/kernel/pci.c
+++ b/lib/kernel/pci.c
@@ -33,7 +33,7 @@ int pci_init(struct pci *p)
 	}
 
 	while ((e = readdir(dp))) {
-		struct pci_device *d = alloc(sizeof(struct pci_device));
+		struct pci_device *d = (struct pci_device *) alloc(sizeof(struct pci_device));
 
 		struct { const char *s; int *p; } map[] = {
 			{ "vendor", &d->id.vendor },
diff --git a/lib/kernel/vfio.c b/lib/kernel/vfio.c
index 2bed71df4..0e1bd04cc 100644
--- a/lib/kernel/vfio.c
+++ b/lib/kernel/vfio.c
@@ -248,7 +248,7 @@ int vfio_device_attach(struct vfio_device *d, struct vfio_container *c, const ch
 
 	/* Check if group already exists */
 	for (size_t i = 0; i < list_length(&c->groups); i++) {
-		struct vfio_group *h = list_at(&c->groups, i);
+		struct vfio_group *h = (struct vfio_group *) list_at(&c->groups, i);
 
 		if (h->index == index)
 			g = h;
@@ -324,8 +324,8 @@ int vfio_pci_reset(struct vfio_device *d)
 	size_t reset_infolen = sizeof(struct vfio_pci_hot_reset_info) + sizeof(struct vfio_pci_dependent_device) * 64;
 	size_t resetlen = sizeof(struct vfio_pci_hot_reset) + sizeof(int32_t) * 1;
 
-	struct vfio_pci_hot_reset_info *reset_info = alloc(reset_infolen);
-	struct vfio_pci_hot_reset *reset = alloc(resetlen);
+	struct vfio_pci_hot_reset_info *reset_info = (struct vfio_pci_hot_reset_info *) alloc(reset_infolen);
+	struct vfio_pci_hot_reset *reset = (struct vfio_pci_hot_reset *) alloc(resetlen);
 
 	reset_info->argsz = reset_infolen;
 	reset->argsz = resetlen;
@@ -500,7 +500,7 @@ void vfio_dump(struct vfio_container *v)
 	info("VFIO Extensions: %#x", v->extensions);
 
 	for (size_t i = 0; i < list_length(&v->groups); i++) {
-		struct vfio_group *g = list_at(&v->groups, i);
+		struct vfio_group *g = (struct vfio_group *) list_at(&v->groups, i);
 
 		info("VFIO Group %u, viable=%u, container=%d", g->index,
 			(g->status.flags & VFIO_GROUP_FLAGS_VIABLE) > 0,
@@ -509,7 +509,7 @@ void vfio_dump(struct vfio_container *v)
 
 
 		for (size_t i = 0; i < list_length(&g->devices); i++) { INDENT
-			struct vfio_device *d = list_at(&g->devices, i);
+			struct vfio_device *d = (struct vfio_device *) list_at(&g->devices, i);
 
 			info("Device %s: regions=%u, irqs=%u, flags=%#x", d->name,
 				d->info.num_regions,
diff --git a/lib/list.c b/lib/list.c
index 32cac84a4..82c6a17db 100644
--- a/lib/list.c
+++ b/lib/list.c
@@ -58,7 +58,7 @@ int list_init(struct list *l)
 	l->array = NULL;
 
 	l->state = STATE_INITIALIZED;
-	
+
 	return 0;
 }
 
diff --git a/lib/mapping.c b/lib/mapping.c
index 3885b0d84..d744e7dd0 100644
--- a/lib/mapping.c
+++ b/lib/mapping.c
@@ -211,7 +211,7 @@ int mapping_parse_list(struct list *l, json_t *cfg, struct list *nodes)
 
 	off = 0;
 	json_array_foreach(json_mapping, i, json_entry) {
-		struct mapping_entry *e = alloc(sizeof(struct mapping_entry));
+		struct mapping_entry *e = (struct mapping_entry *) alloc(sizeof(struct mapping_entry));
 
 		ret = mapping_parse(e, json_entry, nodes);
 		if (ret)
@@ -352,7 +352,7 @@ int mapping_remap(struct list *m, struct sample *remapped, struct sample *origin
 	remapped->id       = original->id;
 
 	for (size_t i = 0; i < list_length(m); i++) {
-		struct mapping_entry *me = list_at(m, i);
+		struct mapping_entry *me = (struct mapping_entry *) list_at(m, i);
 
 		ret = mapping_update(me, remapped, original, s);
 		if (ret)
diff --git a/lib/memory.c b/lib/memory.c
index af41b9a85..1cfa0743a 100644
--- a/lib/memory.c
+++ b/lib/memory.c
@@ -155,7 +155,7 @@ static int memory_hugepage_free(struct memtype *m, void *ptr, size_t len)
 void* memory_managed_alloc(struct memtype *m, size_t len, size_t alignment)
 {
 	/* Simple first-fit allocation */
-	struct memblock *first = m->_vd;
+	struct memblock *first = (struct memblock *) m->_vd;
 	struct memblock *block;
 
 	for (block = first; block != NULL; block = block->next) {
@@ -230,7 +230,7 @@ void* memory_managed_alloc(struct memtype *m, size_t len, size_t alignment)
 
 int memory_managed_free(struct memtype *m, void *ptr, size_t len)
 {
-	struct memblock *first = m->_vd;
+	struct memblock *first = (struct memblock *) m->_vd;
 	struct memblock *block;
 	char *cptr = ptr;
 
diff --git a/lib/node.c b/lib/node.c
index 4ccb44c1c..2d68c1837 100644
--- a/lib/node.c
+++ b/lib/node.c
@@ -58,7 +58,7 @@ int node_init(struct node *n, struct node_type *vt)
 
 	/* Add internal hooks if they are not already in the list */
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *q = list_at(&plugins, i);
+		struct plugin *q = (struct plugin *) list_at(&plugins, i);
 
 		if (q->type != PLUGIN_TYPE_HOOK)
 			continue;
@@ -66,7 +66,7 @@ int node_init(struct node *n, struct node_type *vt)
 		struct hook_type *vt = &q->hook;
 
 		if ((vt->flags & HOOK_NODE) && (vt->flags & HOOK_BUILTIN)) {
-			struct hook *h = alloc(sizeof(struct hook));
+			struct hook *h = (struct hook *) alloc(sizeof(struct hook));
 
 			ret = hook_init(h, vt, NULL, n);
 			if (ret)
@@ -180,7 +180,7 @@ int node_start(struct node *n)
 	info("Starting node %s", node_name_long(n));
 	{ INDENT
 		for (size_t i = 0; i < list_length(&n->hooks); i++) {
-			struct hook *h = list_at(&n->hooks, i);
+			struct hook *h = (struct hook *) list_at(&n->hooks, i);
 
 			ret = hook_start(h);
 			if (ret)
@@ -209,7 +209,7 @@ int node_stop(struct node *n)
 	info("Stopping node %s", node_name(n));
 	{ INDENT
 		for (size_t i = 0; i < list_length(&n->hooks); i++) {
-			struct hook *h = list_at(&n->hooks, i);
+			struct hook *h = (struct hook *) list_at(&n->hooks, i);
 
 			ret = hook_stop(h);
 			if (ret)
@@ -431,7 +431,7 @@ invalid:
 
 invalid2:
 	for (size_t i = 0; i < list_length(all); i++) {
-		struct node *n = list_at(all, i);
+		struct node *n = (struct node *) list_at(all, i);
 
 		strcatf(&allstr, " %s", node_name_short(n));
 	}
diff --git a/lib/nodes/cbuilder.c b/lib/nodes/cbuilder.c
index 7ffda7a31..0c0b28bfb 100644
--- a/lib/nodes/cbuilder.c
+++ b/lib/nodes/cbuilder.c
@@ -15,7 +15,7 @@
 
 int cbuilder_parse(struct node *n, json_t *cfg)
 {
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 	json_t *json_param, *json_params = NULL;
 
 	const char *model;
@@ -58,7 +58,7 @@ int cbuilder_parse(struct node *n, json_t *cfg)
 int cbuilder_start(struct node *n)
 {
 	int ret;
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 
 	/* Initialize mutex and cv */
 	pthread_mutex_init(&cb->mtx, NULL);
@@ -83,7 +83,7 @@ int cbuilder_start(struct node *n)
 int cbuilder_stop(struct node *n)
 {
 	int ret;
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 
 	ret = close(cb->eventfd);
 	if (ret)
@@ -96,7 +96,7 @@ int cbuilder_stop(struct node *n)
 
 int cbuilder_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 	struct sample *smp = smps[0];
 
 	uint64_t cntr;
@@ -125,7 +125,7 @@ int cbuilder_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 int cbuilder_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 	struct sample *smp = smps[0];
 
 	pthread_mutex_lock(&cb->mtx);
@@ -147,7 +147,7 @@ int cbuilder_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int cbuilder_fd(struct node *n)
 {
-	struct cbuilder *cb = n->_vd;
+	struct cbuilder *cb = (struct cbuilder *) n->_vd;
 
 	return cb->eventfd;
 }
diff --git a/lib/nodes/file.c b/lib/nodes/file.c
index ad80afda1..86a205058 100644
--- a/lib/nodes/file.c
+++ b/lib/nodes/file.c
@@ -142,7 +142,7 @@ int file_parse(struct node *n, json_t *cfg)
 
 char * file_print(struct node *n)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 	char *buf = NULL;
 
 	const char *epoch_str = NULL;
@@ -196,7 +196,7 @@ char * file_print(struct node *n)
 
 int file_start(struct node *n)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 
 	struct timespec now = time_now();
 	int ret, flags;
@@ -250,7 +250,7 @@ int file_start(struct node *n)
 
 int file_stop(struct node *n)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 	int ret;
 
 	task_destroy(&f->task);
@@ -270,7 +270,7 @@ int file_stop(struct node *n)
 
 int file_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 	int ret;
 	uint64_t steps;
 
@@ -337,7 +337,7 @@ retry:	ret = io_scan(&f->io, smps, cnt);
 
 int file_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 
 	assert(cnt == 1);
 
@@ -348,7 +348,7 @@ int file_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int file_fd(struct node *n)
 {
-	struct file *f = n->_vd;
+	struct file *f = (struct file *) n->_vd;
 
 	if (f->rate)
 		return task_fd(&f->task);
diff --git a/lib/nodes/fpga.c b/lib/nodes/fpga.c
index 308a2b4f3..502d59900 100644
--- a/lib/nodes/fpga.c
+++ b/lib/nodes/fpga.c
@@ -80,7 +80,7 @@ int fpga_deinit()
 
 int fpga_parse(struct node *n, json_t *cfg)
 {
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct fpga_card *card;
 	struct fpga_ip *ip;
 
@@ -124,7 +124,7 @@ int fpga_parse(struct node *n, json_t *cfg)
 
 char * fpga_print(struct node *n)
 {
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct fpga_card *c = f->ip->card;
 
 	if (f->ip)
@@ -141,7 +141,7 @@ int fpga_start(struct node *n)
 {
 	int ret;
 
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct fpga_card *c = f->ip->card;
 
 	fpga_card_init(c, f->pci, f->vfio_container);
@@ -176,7 +176,7 @@ int fpga_stop(struct node *n)
 {
 	int ret;
 
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct fpga_card *c = f->ip->card;
 
 	switch (f->ip->_vt->type) {
@@ -202,7 +202,7 @@ int fpga_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int ret;
 
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct sample *smp = smps[0];
 
 	size_t recvlen;
@@ -243,7 +243,7 @@ int fpga_read(struct node *n, struct sample *smps[], unsigned cnt)
 int fpga_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int ret;
-	struct fpga *f = n->_vd;
+	struct fpga *f = (struct fpga *) n->_vd;
 	struct sample *smp = smps[0];
 
 	size_t sentlen;
diff --git a/lib/nodes/influxdb.c b/lib/nodes/influxdb.c
index 1c08f5bd9..c261bbc11 100644
--- a/lib/nodes/influxdb.c
+++ b/lib/nodes/influxdb.c
@@ -28,7 +28,7 @@
 
 int influxdb_parse(struct node *n, json_t *cfg)
 {
-	struct influxdb *i = n->_vd;
+	struct influxdb *i = (struct influxdb *) n->_vd;
 
 	json_t *json_fields = NULL;
 	json_error_t err;
@@ -83,7 +83,7 @@ int influxdb_parse(struct node *n, json_t *cfg)
 int influxdb_open(struct node *n)
 {
 	int ret;
-	struct influxdb *i = n->_vd;
+	struct influxdb *i = (struct influxdb *) n->_vd;
 
 	struct addrinfo hints, *servinfo, *p;
 
@@ -119,7 +119,7 @@ int influxdb_open(struct node *n)
 
 int influxdb_close(struct node *n)
 {
-	struct influxdb *i= n->_vd;
+	struct influxdb *i = (struct influxdb *) n->_vd;
 
 	close(i->sd);
 
@@ -134,7 +134,7 @@ int influxdb_close(struct node *n)
 
 int influxdb_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct influxdb *i = n->_vd;
+	struct influxdb *i = (struct influxdb *) n->_vd;
 
 	char *buf = NULL;
 	ssize_t sentlen, buflen;
@@ -148,7 +148,7 @@ int influxdb_write(struct node *n, struct sample *smps[], unsigned cnt)
 			strcatf(&buf, "%c", j == 0 ? ' ' : ',');
 
 			if (j < list_length(&i->fields)) {
-				char *field = list_at(&i->fields, j);
+				char *field = (char *) list_at(&i->fields, j);
 
 				strcatf(&buf, "%s=", field);
 			}
@@ -179,7 +179,7 @@ int influxdb_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 char * influxdb_print(struct node *n)
 {
-	struct influxdb *i = n->_vd;
+	struct influxdb *i = (struct influxdb *) n->_vd;
 	char *buf = NULL;
 
 	strcatf(&buf, "host=%s, port=%s, key=%s, #fields=%zu", i->host, i->port, i->key, list_length(&i->fields));
diff --git a/lib/nodes/loopback.c b/lib/nodes/loopback.c
index 755d48f7a..1c9cbd7fa 100644
--- a/lib/nodes/loopback.c
+++ b/lib/nodes/loopback.c
@@ -28,7 +28,7 @@
 
 int loopback_parse(struct node *n, json_t *cfg)
 {
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 
 	json_error_t err;
 	int ret;
@@ -48,7 +48,7 @@ int loopback_parse(struct node *n, json_t *cfg)
 int loopback_open(struct node *n)
 {
 	int ret;
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 
 	ret = pool_init(&l->pool, l->queuelen, SAMPLE_LEN(n->samplelen), &memtype_hugepage);
 	if (ret)
@@ -60,7 +60,7 @@ int loopback_open(struct node *n)
 int loopback_close(struct node *n)
 {
 	int ret;
-	struct loopback *l= n->_vd;
+	struct loopback *l= (struct loopback *) n->_vd;
 
 	ret = pool_destroy(&l->pool);
 	if (ret)
@@ -73,7 +73,7 @@ int loopback_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int avail;
 
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 	struct sample *cpys[cnt];
 
 	avail = queue_signalled_pull_many(&l->queue, (void **) cpys, cnt);
@@ -90,7 +90,7 @@ int loopback_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int copied;
 
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 	struct sample *copies[cnt];
 
 	copied = sample_alloc_many(&l->pool, copies, cnt);
@@ -104,7 +104,7 @@ int loopback_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 char * loopback_print(struct node *n)
 {
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 	char *buf = NULL;
 
 	strcatf(&buf, "queuelen=%d", l->queuelen);
@@ -114,7 +114,7 @@ char * loopback_print(struct node *n)
 
 int loopback_fd(struct node *n)
 {
-	struct loopback *l = n->_vd;
+	struct loopback *l = (struct loopback *) n->_vd;
 
 	return queue_signalled_fd(&l->queue);
 }
diff --git a/lib/nodes/nanomsg.c b/lib/nodes/nanomsg.c
index dafde69a1..8061183e7 100644
--- a/lib/nodes/nanomsg.c
+++ b/lib/nodes/nanomsg.c
@@ -31,7 +31,7 @@
 
 int nanomsg_reverse(struct node *n)
 {
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	if (list_length(&m->publisher.endpoints)  != 1 ||
 	    list_length(&m->subscriber.endpoints) != 1)
@@ -80,7 +80,7 @@ static int nanomsg_parse_endpoints(struct list *l, json_t *cfg)
 int nanomsg_parse(struct node *n, json_t *cfg)
 {
 	int ret;
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	const char *format = "villas-human";
 
@@ -121,14 +121,14 @@ int nanomsg_parse(struct node *n, json_t *cfg)
 
 char * nanomsg_print(struct node *n)
 {
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	char *buf = NULL;
 
 	strcatf(&buf, "format=%s, subscribe=[ ", plugin_name(m->format));
 
 	for (size_t i = 0; i < list_length(&m->subscriber.endpoints); i++) {
-		char *ep = list_at(&m->subscriber.endpoints, i);
+		char *ep = (char *) list_at(&m->subscriber.endpoints, i);
 
 		strcatf(&buf, "%s ", ep);
 	}
@@ -136,7 +136,7 @@ char * nanomsg_print(struct node *n)
 	strcatf(&buf, "], publish=[ ");
 
 	for (size_t i = 0; i < list_length(&m->publisher.endpoints); i++) {
-		char *ep = list_at(&m->publisher.endpoints, i);
+		char *ep = (char *) list_at(&m->publisher.endpoints, i);
 
 		strcatf(&buf, "%s ", ep);
 	}
@@ -149,7 +149,7 @@ char * nanomsg_print(struct node *n)
 int nanomsg_start(struct node *n)
 {
 	int ret;
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	ret = m->subscriber.socket = nn_socket(AF_SP, NN_SUB);
 	if (ret < 0)
@@ -166,7 +166,7 @@ int nanomsg_start(struct node *n)
 
 	/* Bind publisher to socket */
 	for (size_t i = 0; i < list_length(&m->publisher.endpoints); i++) {
-		char *ep = list_at(&m->publisher.endpoints, i);
+		char *ep = (char *) list_at(&m->publisher.endpoints, i);
 
 		ret = nn_bind(m->publisher.socket, ep);
 		if (ret < 0) {
@@ -177,7 +177,7 @@ int nanomsg_start(struct node *n)
 
 	/* Sonnect subscribers socket */
 	for (size_t i = 0; i < list_length(&m->subscriber.endpoints); i++) {
-		char *ep = list_at(&m->subscriber.endpoints, i);
+		char *ep = (char *) list_at(&m->subscriber.endpoints, i);
 
 		ret = nn_connect(m->subscriber.socket, ep);
 		if (ret < 0) {
@@ -192,7 +192,7 @@ int nanomsg_start(struct node *n)
 int nanomsg_stop(struct node *n)
 {
 	int ret;
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	ret = nn_close(m->subscriber.socket);
 	if (ret < 0)
@@ -214,7 +214,7 @@ int nanomsg_deinit()
 
 int nanomsg_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 	int bytes;
 	char data[NANOMSG_MAX_PACKET_LEN];
 
@@ -229,7 +229,7 @@ int nanomsg_read(struct node *n, struct sample *smps[], unsigned cnt)
 int nanomsg_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int ret;
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	size_t wbytes;
 
@@ -249,7 +249,7 @@ int nanomsg_write(struct node *n, struct sample *smps[], unsigned cnt)
 int nanomsg_fd(struct node *n)
 {
 	int ret;
-	struct nanomsg *m = n->_vd;
+	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
 	int fd;
 	size_t len = sizeof(fd);
diff --git a/lib/nodes/ngsi.c b/lib/nodes/ngsi.c
index b9802eaf4..b670cdc48 100644
--- a/lib/nodes/ngsi.c
+++ b/lib/nodes/ngsi.c
@@ -75,7 +75,7 @@ static json_t* ngsi_build_entity(struct ngsi *i, struct sample *smps[], unsigned
 		json_t *attributes = json_array();
 
 		for (size_t j = 0; j < list_length(&i->mapping); j++) {
-			struct ngsi_attribute *map = list_at(&i->mapping, j);
+			struct ngsi_attribute *map = (struct ngsi_attribute *) list_at(&i->mapping, j);
 
 			json_t *attribute = json_pack("{ s: s, s: s }",
 				"name",		map->name,
@@ -99,7 +99,7 @@ static json_t* ngsi_build_entity(struct ngsi *i, struct sample *smps[], unsigned
 				json_t *metadatas = json_array();
 
 				for (size_t i = 0; i < list_length(&map->metadata); i++) {
-					struct ngsi_metadata *meta = list_at(&map->metadata, i);
+					struct ngsi_metadata *meta = (struct ngsi_metadata *) list_at(&map->metadata, i);
 
 					json_array_append_new(metadatas, json_pack("{ s: s, s: s, s: s }",
 						"name",  meta->name,
@@ -214,7 +214,7 @@ static int ngsi_parse_mapping(struct list *mapping, json_t *cfg)
 		if (!token)
 			return -2;
 
-		struct ngsi_attribute *a = alloc(sizeof(struct ngsi_attribute));
+		struct ngsi_attribute *a = (struct ngsi_attribute *) alloc(sizeof(struct ngsi_attribute));
 
 		a->index = index;
 
@@ -406,7 +406,7 @@ int ngsi_deinit()
 
 int ngsi_parse(struct node *n, json_t *cfg)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 
 	int ret;
 	json_error_t err;
@@ -440,7 +440,7 @@ int ngsi_parse(struct node *n, json_t *cfg)
 
 char * ngsi_print(struct node *n)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 
 	return strf("endpoint=%s, timeout=%.3f secs, #mappings=%zu",
 		i->endpoint, i->timeout, list_length(&i->mapping));
@@ -467,7 +467,7 @@ static int ngsi_attribute_destroy(struct ngsi_attribute *attr)
 
 int ngsi_destroy(struct node *n)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 
 	list_destroy(&i->mapping, (dtor_cb_t) ngsi_attribute_destroy, true);
 
@@ -476,7 +476,7 @@ int ngsi_destroy(struct node *n)
 
 int ngsi_start(struct node *n)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 	int ret;
 
 	i->curl = curl_easy_init();
@@ -518,7 +518,7 @@ int ngsi_start(struct node *n)
 
 int ngsi_stop(struct node *n)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 	int ret;
 
 	/* Delete complete entity (not just attributes) */
@@ -536,7 +536,7 @@ int ngsi_stop(struct node *n)
 
 int ngsi_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 	int ret;
 
 	if (task_wait(&i->task) == 0)
@@ -561,7 +561,7 @@ out:	json_decref(entity);
 
 int ngsi_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 	int ret;
 
 	json_t *entity = ngsi_build_entity(i, smps, cnt, NGSI_ENTITY_VALUES);
@@ -575,7 +575,7 @@ int ngsi_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int ngsi_fd(struct node *n)
 {
-	struct ngsi *i = n->_vd;
+	struct ngsi *i = (struct ngsi *) n->_vd;
 
 	return task_fd(&i->task);
 }
diff --git a/lib/nodes/opal.c b/lib/nodes/opal.c
index 9b7aa5a98..af378ffa9 100644
--- a/lib/nodes/opal.c
+++ b/lib/nodes/opal.c
@@ -149,7 +149,7 @@ int opal_print_global()
 
 int opal_parse(struct node *n, json_t *cfg)
 {
-	struct opal *o = n->_vd;
+	struct opal *o = (struct opal *) n->_vd;
 
 	int ret;
 	json_error_t err;
@@ -167,7 +167,7 @@ int opal_parse(struct node *n, json_t *cfg)
 
 char * opal_print(struct node *n)
 {
-	struct opal *o = n->_vd;
+	struct opal *o = (struct opal *) n->_vd;
 
 	/** @todo: Print send_params, recv_params */
 
@@ -177,7 +177,7 @@ char * opal_print(struct node *n)
 
 int opal_start(struct node *n)
 {
-	struct opal *o = n->_vd;
+	struct opal *o = (struct opal *) n->_vd;
 
 	/* Search for valid send and recv ids */
 	int sfound = 0, rfound = 0;
@@ -206,7 +206,7 @@ int opal_stop(struct node *n)
 
 int opal_read(struct node *n, struct pool *pool, unsigned cnt)
 {
-	struct opal *o = n->_vd;
+	struct opal *o = (struct opal *) n->_vd;
 
 	int state, len, ret;
 	unsigned id;
@@ -271,7 +271,7 @@ int opal_read(struct node *n, struct pool *pool, unsigned cnt)
 
 int opal_write(struct node *n, struct pool *pool, unsigned cnt)
 {
-	struct opal *o = n->_vd;
+	struct opal *o = (struct opal *) n->_vd;
 
 	struct msg *m = &pool[first % poolsize];
 
diff --git a/lib/nodes/shmem.c b/lib/nodes/shmem.c
index a141226f4..94f52d566 100644
--- a/lib/nodes/shmem.c
+++ b/lib/nodes/shmem.c
@@ -38,7 +38,7 @@
 
 int shmem_parse(struct node *n, json_t *cfg)
 {
-	struct shmem *shm = n->_vd;
+	struct shmem *shm = (struct shmem *) n->_vd;
 	const char *val;
 
 	int ret;
@@ -85,7 +85,7 @@ int shmem_parse(struct node *n, json_t *cfg)
 
 int shmem_open(struct node *n)
 {
-	struct shmem *shm = n->_vd;
+	struct shmem *shm = (struct shmem *) n->_vd;
 	int ret;
 
 	if (shm->exec) {
@@ -103,14 +103,14 @@ int shmem_open(struct node *n)
 
 int shmem_close(struct node *n)
 {
-	struct shmem* shm = n->_vd;
+	struct shmem* shm = (struct shmem *) n->_vd;
 
 	return shmem_int_close(&shm->intf);
 }
 
 int shmem_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct shmem *shm = n->_vd;
+	struct shmem *shm = (struct shmem *) n->_vd;
 	int recv;
 	struct sample *shared_smps[cnt];
 
@@ -133,7 +133,7 @@ int shmem_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 int shmem_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct shmem *shm = n->_vd;
+	struct shmem *shm = (struct shmem *) n->_vd;
 	struct sample *shared_smps[cnt]; /* Samples need to be copied to the shared pool first */
 	int avail, pushed, copied;
 
@@ -158,7 +158,7 @@ int shmem_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 char * shmem_print(struct node *n)
 {
-	struct shmem *shm = n->_vd;
+	struct shmem *shm = (struct shmem *) n->_vd;
 	char *buf = NULL;
 
 	strcatf(&buf, "out_name=%s, in_name=%s, queuelen=%d, polling=%s",
diff --git a/lib/nodes/signal.c b/lib/nodes/signal.c
index 0900eba98..f34efd2fa 100644
--- a/lib/nodes/signal.c
+++ b/lib/nodes/signal.c
@@ -51,7 +51,7 @@ enum signal_type signal_lookup_type(const char *type)
 
 int signal_parse(struct node *n, json_t *cfg)
 {
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 
 	int ret;
 	const char *type = NULL;
@@ -101,7 +101,7 @@ int signal_parse_cli(struct node *n, int argc, char *argv[])
 {
 	char *type;
 
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 
 	/* Default values */
 	s->rate = 10;
@@ -172,7 +172,7 @@ check:		if (optarg == endptr)
 int signal_open(struct node *n)
 {
 	int ret;
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 
 	s->counter = 0;
 	s->started = time_now();
@@ -194,7 +194,7 @@ int signal_open(struct node *n)
 int signal_close(struct node *n)
 {
 	int ret;
-	struct signal* s = n->_vd;
+	struct signal* s = (struct signal *) n->_vd;
 
 	if (s->rt) {
 		ret = task_destroy(&s->task);
@@ -209,7 +209,7 @@ int signal_close(struct node *n)
 
 int signal_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 	struct sample *t = smps[0];
 
 	struct timespec ts;
@@ -270,7 +270,7 @@ int signal_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 char * signal_print(struct node *n)
 {
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 	char *type, *buf = NULL;
 
 	switch (s->type) {
@@ -296,7 +296,7 @@ char * signal_print(struct node *n)
 
 int signal_fd(struct node *n)
 {
-	struct signal *s = n->_vd;
+	struct signal *s = (struct signal *) n->_vd;
 
 	return task_fd(&s->task);
 }
diff --git a/lib/nodes/socket.c b/lib/nodes/socket.c
index 5aa5f38bc..0afe867a1 100644
--- a/lib/nodes/socket.c
+++ b/lib/nodes/socket.c
@@ -62,8 +62,8 @@ int socket_init(struct super_node *sn)
 
 	/* Gather list of used network interfaces */
 	for (size_t i = 0; i < list_length(&p.node.instances); i++) {
-		struct node *n = list_at(&p.node.instances, i);
-		struct socket *s = n->_vd;
+		struct node *n = (struct node *) list_at(&p.node.instances, i);
+		struct socket *s = (struct socket *) n->_vd;
 		struct rtnl_link *link;
 
 		/* Determine outgoing interface */
@@ -78,7 +78,7 @@ int socket_init(struct super_node *sn)
 		struct interface *i;
 
 		for (size_t k = 0; k < list_length(&interfaces); k++) {
-			i = list_at(&interfaces, k);
+			i = (struct interface *) list_at(&interfaces, k);
 
 			if (rtnl_link_get_ifindex(i->nl_link) == rtnl_link_get_ifindex(link))
 				goto found;
@@ -97,7 +97,7 @@ found:		list_push(&i->sockets, s);
 	}
 
 	for (size_t j = 0; j < list_length(&interfaces); j++) {
-		struct interface *i = list_at(&interfaces, j);
+		struct interface *i = (struct interface *) list_at(&interfaces, j);
 
 		if_start(i);
 	}
@@ -110,7 +110,7 @@ int socket_deinit()
 {
 #ifdef WITH_NETEM
 	for (size_t j = 0; j < list_length(&interfaces); j++) {
-		struct interface *i = list_at(&interfaces, j);
+		struct interface *i = (struct interface *) list_at(&interfaces, j);
 
 		if_stop(i);
 	}
@@ -123,7 +123,7 @@ int socket_deinit()
 
 char * socket_print(struct node *n)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 	char *layer = NULL, *buf;
 
 	switch (s->layer) {
@@ -159,7 +159,7 @@ char * socket_print(struct node *n)
 
 int socket_start(struct node *n)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 	int ret;
 
 	/* Some checks on the addresses */
@@ -263,7 +263,7 @@ int socket_start(struct node *n)
 
 int socket_reverse(struct node *n)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 	union sockaddr_union tmp;
 
 	tmp = s->local;
@@ -276,7 +276,7 @@ int socket_reverse(struct node *n)
 int socket_stop(struct node *n)
 {
 	int ret;
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	if (s->multicast.enabled) {
 		ret = setsockopt(s->sd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &s->multicast.mreq, sizeof(s->multicast.mreq));
@@ -293,7 +293,7 @@ int socket_stop(struct node *n)
 int socket_destroy(struct node *n)
 {
 #ifdef WITH_NETEM
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	rtnl_qdisc_put(s->tc_qdisc);
 	rtnl_cls_put(s->tc_classifier);
@@ -305,7 +305,7 @@ int socket_destroy(struct node *n)
 int socket_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int ret;
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	char buf[SOCKET_MAX_PACKET_LEN];
 	char *bufptr = buf;
@@ -355,7 +355,7 @@ int socket_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 int socket_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	char data[SOCKET_MAX_PACKET_LEN];
 	int ret;
@@ -386,7 +386,7 @@ int socket_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int socket_parse(struct node *n, json_t *cfg)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	const char *local, *remote;
 	const char *layer = NULL;
@@ -685,7 +685,7 @@ int socket_compare_addr(struct sockaddr *x, struct sockaddr *y)
 
 int socket_fd(struct node *n)
 {
-	struct socket *s = n->_vd;
+	struct socket *s = (struct socket *) n->_vd;
 
 	return s->sd;
 }
diff --git a/lib/nodes/stats.c b/lib/nodes/stats.c
index 57671065b..f883d1fe4 100644
--- a/lib/nodes/stats.c
+++ b/lib/nodes/stats.c
@@ -48,7 +48,7 @@ int stats_node_init(struct super_node *sn)
 
 int stats_node_start(struct node *n)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 	int ret;
 
 	ret = task_init(&s->task, s->rate, CLOCK_MONOTONIC);
@@ -64,7 +64,7 @@ int stats_node_start(struct node *n)
 
 int stats_node_stop(struct node *n)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 	int ret;
 
 	ret = task_destroy(&s->task);
@@ -76,14 +76,14 @@ int stats_node_stop(struct node *n)
 
 char * stats_node_print(struct node *n)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 
 	return strf("node=%s, rate=%f", s->node_str, s->rate);
 }
 
 int stats_node_parse(struct node *n, json_t *cfg)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 
 	int ret;
 	json_error_t err;
@@ -109,7 +109,7 @@ int stats_node_parse(struct node *n, json_t *cfg)
 
 int stats_node_destroy(struct node *n)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 
 	if (s->node_str)
 		free(s->node_str);
@@ -119,7 +119,7 @@ int stats_node_destroy(struct node *n)
 
 int stats_node_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct stats_node *sn = n->_vd;
+	struct stats_node *sn = (struct stats_node *) n->_vd;
 	struct stats *s = sn->node->stats;
 
 	if (!cnt)
@@ -149,7 +149,7 @@ int stats_node_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 int stats_node_fd(struct node *n)
 {
-	struct stats_node *s = n->_vd;
+	struct stats_node *s = (struct stats_node *) n->_vd;
 
 	return task_fd(&s->task);
 }
diff --git a/lib/nodes/test_rtt.c b/lib/nodes/test_rtt.c
index 5e2768cb6..57a0d4d58 100644
--- a/lib/nodes/test_rtt.c
+++ b/lib/nodes/test_rtt.c
@@ -32,7 +32,7 @@
 static int test_rtt_case_start(struct test_rtt *t, int id)
 {
 	int ret;
-	struct test_rtt_case *c = list_at(&t->cases, id);
+	struct test_rtt_case *c = (struct test_rtt_case *) list_at(&t->cases, id);
 
 	/* Open file */
 	ret = io_open(&t->io, c->filename);
@@ -70,7 +70,7 @@ static int test_rtt_case_stop(struct test_rtt *t, int id)
 int test_rtt_parse(struct node *n, json_t *cfg)
 {
 	int ret;
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	const char *format = "villas-human";
 	const char *output = ".";
@@ -175,7 +175,7 @@ int test_rtt_parse(struct node *n, json_t *cfg)
 
 		for (int i = 0; i < numrates; i++) {
 			for (int j = 0; j < numvalues; j++) {
-				struct test_rtt_case *c = alloc(sizeof(struct test_rtt_case));
+				struct test_rtt_case *c = (struct test_rtt_case *) alloc(sizeof(struct test_rtt_case));
 
 				c->rate = rates[i];
 				c->values = values[j];
@@ -203,7 +203,7 @@ int test_rtt_parse(struct node *n, json_t *cfg)
 int test_rtt_destroy(struct node *n)
 {
 	int ret;
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	ret = list_destroy(&t->cases, NULL, true);
 	if (ret)
@@ -228,7 +228,7 @@ int test_rtt_destroy(struct node *n)
 
 char * test_rtt_print(struct node *n)
 {
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	return strf("output=%s, prefix=%s, cooldown=%f, #cases=%zu", t->output, t->prefix, t->cooldown, list_length(&t->cases));
 }
@@ -237,7 +237,7 @@ int test_rtt_start(struct node *n)
 {
 	int ret;
 	struct stat st;
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 	struct test_rtt_case *c = list_first(&t->cases);
 
 	/* Create folder for results if not present */
@@ -265,7 +265,7 @@ int test_rtt_start(struct node *n)
 int test_rtt_stop(struct node *n)
 {
 	int ret;
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	if (t->counter != -1) {
 		ret = test_rtt_case_stop(t, t->current);
@@ -281,7 +281,7 @@ int test_rtt_read(struct node *n, struct sample *smps[], unsigned cnt)
 	int i, ret, values;
 	uint64_t steps;
 
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	if (t->counter == -1) {
 		if (t->current == -1) {
@@ -301,7 +301,7 @@ int test_rtt_read(struct node *n, struct sample *smps[], unsigned cnt)
 			pause();
 		}
 		else {
-			struct test_rtt_case *c = list_at(&t->cases, t->current);
+			struct test_rtt_case *c = (struct test_rtt_case *) list_at(&t->cases, t->current);
 			info("Starting case #%d: filename=%s, rate=%f, values=%d, limit=%d", t->current, c->filename, c->rate, c->values, c->limit);
 			ret = test_rtt_case_start(t, t->current);
 			if (ret)
@@ -309,7 +309,7 @@ int test_rtt_read(struct node *n, struct sample *smps[], unsigned cnt)
 		}
 	}
 
-	struct test_rtt_case *c = list_at(&t->cases, t->current);
+	struct test_rtt_case *c = (struct test_rtt_case *) list_at(&t->cases, t->current);
 
 	/* Wait */
 	steps = task_wait(&t->task);
@@ -349,8 +349,8 @@ int test_rtt_read(struct node *n, struct sample *smps[], unsigned cnt)
 
 int test_rtt_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
-	struct test_rtt *t = n->_vd;
-	struct test_rtt_case *c = list_at(&t->cases, t->current);
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
+	struct test_rtt_case *c = (struct test_rtt_case *) list_at(&t->cases, t->current);
 
 	int i;
 	for (i = 0; i < cnt; i++) {
@@ -367,7 +367,7 @@ int test_rtt_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int test_rtt_fd(struct node *n)
 {
-	struct test_rtt *t = n->_vd;
+	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
 	return task_fd(&t->task);
 }
diff --git a/lib/nodes/websocket.c b/lib/nodes/websocket.c
index 6c77ab36e..980bd5df4 100644
--- a/lib/nodes/websocket.c
+++ b/lib/nodes/websocket.c
@@ -265,7 +265,7 @@ int websocket_protocol_cb(struct lws *wsi, enum lws_callback_reasons reason, voi
 			if (lws_is_final_fragment(wsi)) {
 				struct timespec ts_recv = time_now();
 
-				struct websocket *w = c->node->_vd;
+				struct websocket *w = (struct websocket *) c->node->_vd;
 				struct sample **smps = alloca(cnt * sizeof(struct sample *));
 
 				ret = sample_alloc_many(&w->pool, smps, cnt);
@@ -322,7 +322,7 @@ int websocket_init(struct super_node *sn)
 int websocket_deinit()
 {
 	for (size_t i = 0; i < list_length(&connections); i++) {
-		struct websocket_connection *c = list_at(&connections, i);
+		struct websocket_connection *c = (struct websocket_connection *) list_at(&connections, i);
 
 		c->state = STATE_SHUTDOWN;
 
@@ -343,7 +343,7 @@ int websocket_deinit()
 int websocket_start(struct node *n)
 {
 	int ret;
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 
 	ret = pool_init(&w->pool, DEFAULT_WEBSOCKET_QUEUELEN, SAMPLE_LEN(DEFAULT_WEBSOCKET_SAMPLELEN), &memtype_hugepage);
 	if (ret)
@@ -354,8 +354,8 @@ int websocket_start(struct node *n)
 		return ret;
 
 	for (int i = 0; i < list_length(&w->destinations); i++) {
-		struct websocket_destination *d = list_at(&w->destinations, i);
-		struct websocket_connection *c = alloc(sizeof(struct websocket_connection));
+		struct websocket_destination *d = (struct websocket_destination *) list_at(&w->destinations, i);
+		struct websocket_connection *c = (struct websocket_connection *) alloc(sizeof(struct websocket_connection));
 
 		c->state = STATE_CONNECTING;
 		c->mode = WEBSOCKET_MODE_CLIENT;
@@ -384,14 +384,14 @@ int websocket_start(struct node *n)
 int websocket_stop(struct node *n)
 {
 	int ret;
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 
 	/* Wait for all connections to be closed */
 	for (;;) {
 		int connecting = 0;
 
 		for (int i = 0; i < list_length(&w->destinations); i++) {
-			struct websocket_destination *d = list_at(&w->destinations, i);
+			struct websocket_destination *d = (struct websocket_destination *) list_at(&w->destinations, i);
 			struct websocket_connection *c = d->info.userdata;
 
 			if (c->state == STATE_CONNECTING)
@@ -406,7 +406,7 @@ int websocket_stop(struct node *n)
 	}
 
 	for (size_t i = 0; i < list_length(&connections); i++) {
-		struct websocket_connection *c = list_at(&connections, i);
+		struct websocket_connection *c = (struct websocket_connection *) list_at(&connections, i);
 
 		if (c->node != n)
 			continue;
@@ -430,7 +430,7 @@ int websocket_stop(struct node *n)
 
 int websocket_destroy(struct node *n)
 {
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 
 	list_destroy(&w->destinations, (dtor_cb_t) websocket_destination_destroy, true);
 
@@ -441,7 +441,7 @@ int websocket_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int avail;
 
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 	struct sample *cpys[cnt];
 
 	avail = queue_signalled_pull_many(&w->queue, (void **) cpys, cnt);
@@ -460,7 +460,7 @@ int websocket_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int avail;
 
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 	struct sample *cpys[cnt];
 
 	/* Make copies of all samples */
@@ -476,7 +476,7 @@ int websocket_write(struct node *n, struct sample *smps[], unsigned cnt)
 	}
 
 	for (size_t i = 0; i < list_length(&connections); i++) {
-		struct websocket_connection *c = list_at(&connections, i);
+		struct websocket_connection *c = (struct websocket_connection *) list_at(&connections, i);
 
 		if (c->node == n || c->node == NULL)
 			websocket_connection_write(c, cpys, cnt);
@@ -489,7 +489,7 @@ int websocket_write(struct node *n, struct sample *smps[], unsigned cnt)
 
 int websocket_parse(struct node *n, json_t *cfg)
 {
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 	int ret;
 
 	size_t index;
@@ -514,7 +514,7 @@ int websocket_parse(struct node *n, json_t *cfg)
 			if (!uri)
 				error("The 'destinations' setting of node %s must be an array of URLs", node_name(n));
 
-			struct websocket_destination *d = alloc(sizeof(struct websocket_destination));
+			struct websocket_destination *d = (struct websocket_destination *) alloc(sizeof(struct websocket_destination));
 
 			d->uri = strdup(uri);
 
@@ -539,14 +539,14 @@ int websocket_parse(struct node *n, json_t *cfg)
 
 char * websocket_print(struct node *n)
 {
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 
 	char *buf = NULL;
 
 	buf = strcatf(&buf, "destinations=[ ");
 
 	for (size_t i = 0; i < list_length(&w->destinations); i++) {
-		struct websocket_destination *d = list_at(&w->destinations, i);
+		struct websocket_destination *d = (struct websocket_destination *) list_at(&w->destinations, i);
 
 		buf = strcatf(&buf, "%s://%s:%d/%s ",
 			d->info.ssl_connection ? "wss" : "ws",
@@ -563,7 +563,7 @@ char * websocket_print(struct node *n)
 
 int websocket_fd(struct node *n)
 {
-	struct websocket *w = n->_vd;
+	struct websocket *w = (struct websocket *) n->_vd;
 
 	return queue_signalled_fd(&w->queue);
 }
diff --git a/lib/nodes/zeromq.c b/lib/nodes/zeromq.c
index 8b84fb31d..f6319a37e 100644
--- a/lib/nodes/zeromq.c
+++ b/lib/nodes/zeromq.c
@@ -76,7 +76,7 @@ static int get_monitor_event(void *monitor, int *value, char **address)
 
 int zeromq_reverse(struct node *n)
 {
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	if (list_length(&z->publisher.endpoints) != 1)
 		return -1;
@@ -92,7 +92,7 @@ int zeromq_reverse(struct node *n)
 
 int zeromq_parse(struct node *n, json_t *cfg)
 {
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	int ret;
 	const char *ep = NULL;
@@ -197,7 +197,7 @@ int zeromq_parse(struct node *n, json_t *cfg)
 
 char * zeromq_print(struct node *n)
 {
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	char *buf = NULL;
 	char *pattern = NULL;
@@ -218,7 +218,7 @@ char * zeromq_print(struct node *n)
 	);
 
 	for (size_t i = 0; i < list_length(&z->publisher.endpoints); i++) {
-		char *ep = list_at(&z->publisher.endpoints, i);
+		char *ep = (char *) list_at(&z->publisher.endpoints, i);
 
 		strcatf(&buf, "%s ", ep);
 	}
@@ -246,7 +246,7 @@ int zeromq_deinit()
 int zeromq_start(struct node *n)
 {
 	int ret;
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	switch (z->pattern) {
 #ifdef ZMQ_BUILD_DISH
@@ -351,7 +351,7 @@ int zeromq_start(struct node *n)
 
 	/* Spawn server for publisher */
 	for (size_t i = 0; i < list_length(&z->publisher.endpoints); i++) {
-		char *ep = list_at(&z->publisher.endpoints, i);
+		char *ep = (char *) list_at(&z->publisher.endpoints, i);
 
 		ret = zmq_bind(z->publisher.socket, ep);
 		if (ret < 0)
@@ -387,7 +387,7 @@ fail:
 int zeromq_stop(struct node *n)
 {
 	int ret;
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	ret = zmq_close(z->subscriber.socket);
 	if (ret)
@@ -405,7 +405,7 @@ int zeromq_stop(struct node *n)
 int zeromq_read(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int recv, ret;
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	zmq_msg_t m;
 
@@ -441,7 +441,7 @@ int zeromq_read(struct node *n, struct sample *smps[], unsigned cnt)
 int zeromq_write(struct node *n, struct sample *smps[], unsigned cnt)
 {
 	int ret;
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	size_t wbytes;
 	zmq_msg_t m;
@@ -491,7 +491,7 @@ fail:
 int zeromq_fd(struct node *n)
 {
 	int ret;
-	struct zeromq *z = n->_vd;
+	struct zeromq *z = (struct zeromq *) n->_vd;
 
 	int fd;
 	size_t len = sizeof(fd);
diff --git a/lib/path.c b/lib/path.c
index 53ee996e1..3c0ae3a5f 100644
--- a/lib/path.c
+++ b/lib/path.c
@@ -98,7 +98,7 @@ static void path_destination_enqueue(struct path *p, struct sample *smps[], unsi
 		warn("Pool underrun in path %s", path_name(p));
 
 	for (size_t i = 0; i < list_length(&p->destinations); i++) {
-		struct path_destination *pd = list_at(&p->destinations, i);
+		struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 		enqueued = queue_push_many(&pd->queue, (void **) clones, cloned);
 		if (enqueued != cnt)
@@ -125,7 +125,7 @@ static void * path_run(void *arg)
 			serror("Failed to poll");
 
 		for (int i = 0; i < p->reader.nfds; i++) {
-			struct path_source *ps = list_at(&p->sources, i);
+			struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 			if (p->reader.pfds[i].revents & POLLIN) {
 				/* Timeout: re-enqueue the last sample */
@@ -202,7 +202,7 @@ out2:					sample_put_many(read_smps, ready);
 		}
 
 		for (size_t i = 0; i < list_length(&p->destinations); i++) {
-			struct path_destination *pd = list_at(&p->destinations, i);
+			struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 			int cnt = pd->node->vectorize;
 			int sent;
@@ -259,7 +259,7 @@ int path_init(struct path *p)
 
 	/* Add internal hooks if they are not already in the list */
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *q = list_at(&plugins, i);
+		struct plugin *q = (struct plugin *) list_at(&plugins, i);
 
 		if (q->type != PLUGIN_TYPE_HOOK)
 			continue;
@@ -267,7 +267,7 @@ int path_init(struct path *p)
 		struct hook_type *vt = &q->hook;
 
 		if ((vt->flags & HOOK_PATH) && (vt->flags & HOOK_BUILTIN)) {
-			struct hook *h = alloc(sizeof(struct hook));
+			struct hook *h = (struct hook *) alloc(sizeof(struct hook));
 
 			ret = hook_init(h, vt, p, NULL);
 			if (ret)
@@ -293,7 +293,7 @@ int path_init2(struct path *p)
 
 	/* Initialize destinations */
 	for (size_t i = 0; i < list_length(&p->destinations); i++) {
-		struct path_destination *pd = list_at(&p->destinations, i);
+		struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 		ret = path_destination_init(pd, p->queuelen);
 		if (ret)
@@ -302,7 +302,7 @@ int path_init2(struct path *p)
 
 	/* Initialize sources */
 	for (size_t i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		ret = path_source_init(ps);
 		if (ret)
@@ -315,13 +315,13 @@ int path_init2(struct path *p)
 	/* Calc sample length of path and initialize bitset */
 	p->samplelen = 0;
 	for (size_t i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		if (ps->masked)
 			bitset_set(&p->mask, i);
 
 		for (size_t i = 0; i < list_length(&ps->mappings); i++) {
-			struct mapping_entry *me = list_at(&ps->mappings, i);
+			struct mapping_entry *me = (struct mapping_entry *) list_at(&ps->mappings, i);
 
 			int len = me->length;
 			int off = me->offset;
@@ -352,7 +352,7 @@ int path_init2(struct path *p)
 	p->reader.pfds = alloc(sizeof(struct pollfd) * p->reader.nfds);
 
 	for (int i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		/* This slot is only used if it is not masked */
 		p->reader.pfds[i].events = POLLIN;
@@ -427,13 +427,13 @@ int path_parse(struct path *p, json_t *cfg, struct list *nodes)
 	}
 
 	for (size_t i = 0; i < list_length(&sources); i++) {
-		struct mapping_entry *me = list_at(&sources, i);
+		struct mapping_entry *me = (struct mapping_entry *) list_at(&sources, i);
 
 		struct path_source *ps = NULL;
 
 		/* Check if there is already a path_source for this source */
 		for (size_t j = 0; j < list_length(&p->sources); j++) {
-			struct path_source *pt = list_at(&p->sources, j);
+			struct path_source *pt = (struct path_source *) list_at(&p->sources, j);
 
 			if (pt->node == me->node) {
 				ps = pt;
@@ -458,9 +458,9 @@ int path_parse(struct path *p, json_t *cfg, struct list *nodes)
 	}
 
 	for (size_t i = 0; i < list_length(&destinations); i++) {
-		struct node *n = list_at(&destinations, i);
+		struct node *n = (struct node *) list_at(&destinations, i);
 
-		struct path_destination *pd = alloc(sizeof(struct path_destination));
+		struct path_destination *pd = (struct path_destination *) alloc(sizeof(struct path_destination));
 
 		pd->node = n;
 
@@ -489,7 +489,7 @@ int path_parse(struct path *p, json_t *cfg, struct list *nodes)
 
 			/* Search correspondending path_source to node */
 			for (size_t i = 0; i < list_length(&p->sources); i++) {
-				struct path_source *pt = list_at(&p->sources, i);
+				struct path_source *pt = (struct path_source *) list_at(&p->sources, i);
 
 				if (pt->node == node) {
 					ps = pt;
@@ -505,7 +505,7 @@ int path_parse(struct path *p, json_t *cfg, struct list *nodes)
 	}
 	else {/* Enable all by default */
 		for (size_t i = 0; i < list_length(&p->sources); i++) {
-			struct path_source *ps = list_at(&p->sources, i);
+			struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 			ps->masked = true;
 		}
@@ -534,14 +534,14 @@ int path_check(struct path *p)
 		error("Setting 'rate' of path %s must be a positive number.", path_name(p));
 
 	for (size_t i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		if (!ps->node->_vt->read)
 			error("Source node '%s' is not supported as a source for path '%s'", node_name(ps->node), path_name(p));
 	}
 
 	for (size_t i = 0; i < list_length(&p->destinations); i++) {
-		struct path_destination *pd = list_at(&p->destinations, i);
+		struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 		if (!pd->node->_vt->write)
 			error("Destiation node '%s' is not supported as a sink for path '%s'", node_name(pd->node), path_name(p));
@@ -588,7 +588,7 @@ int path_start(struct path *p)
 	free(mask);
 
 	for (size_t i = 0; i < list_length(&p->hooks); i++) {
-		struct hook *h = list_at(&p->hooks, i);
+		struct hook *h = (struct hook *) list_at(&p->hooks, i);
 
 		ret = hook_start(h);
 		if (ret)
@@ -601,10 +601,10 @@ int path_start(struct path *p)
 
 	/* We initialize the intial sample with zeros */
 	for (size_t i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		for (size_t j = 0; j < list_length(&ps->mappings); j++) {
-			struct mapping_entry *me = list_at(&ps->mappings, j);
+			struct mapping_entry *me = (struct path_source *) list_at(&ps->mappings, j);
 
 			int len = me->length;
 			int off = me->offset;
@@ -648,7 +648,7 @@ int path_stop(struct path *p)
 		return ret;
 
 	for (size_t i = 0; i < list_length(&p->hooks); i++) {
-		struct hook *h = list_at(&p->hooks, i);
+		struct hook *h = (struct hook *) list_at(&p->hooks, i);
 
 		ret = hook_stop(h);
 		if (ret)
@@ -691,7 +691,7 @@ const char * path_name(struct path *p)
 		strcatf(&p->_name, "[");
 
 		for (size_t i = 0; i < list_length(&p->sources); i++) {
-			struct path_source *ps = list_at(&p->sources, i);
+			struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 			strcatf(&p->_name, " %s", node_name_short(ps->node));
 		}
@@ -699,7 +699,7 @@ const char * path_name(struct path *p)
 		strcatf(&p->_name, " ] " CLR_MAG("=>") " [");
 
 		for (size_t i = 0; i < list_length(&p->destinations); i++) {
-			struct path_destination *pd = list_at(&p->destinations, i);
+			struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 			strcatf(&p->_name, " %s", node_name_short(pd->node));
 		}
@@ -713,14 +713,14 @@ const char * path_name(struct path *p)
 int path_uses_node(struct path *p, struct node *n)
 {
 	for (size_t i = 0; i < list_length(&p->destinations); i++) {
-		struct path_destination *pd = list_at(&p->destinations, i);
+		struct path_destination *pd = (struct path_destination *) list_at(&p->destinations, i);
 
 		if (pd->node == n)
 			return 0;
 	}
 
 	for (size_t i = 0; i < list_length(&p->sources); i++) {
-		struct path_source *ps = list_at(&p->sources, i);
+		struct path_source *ps = (struct path_source *) list_at(&p->sources, i);
 
 		if (ps->node == n)
 			return 0;
@@ -743,8 +743,8 @@ int path_reverse(struct path *p, struct path *r)
 	struct path_destination *orig_pd = list_first(&p->destinations);
 	struct path_source      *orig_ps = list_first(&p->sources);
 
-	struct path_destination *new_pd = alloc(sizeof(struct path_destination));
-	struct path_source      *new_ps = alloc(sizeof(struct path_source));
+	struct path_destination *new_pd = (struct path_destination *) alloc(sizeof(struct path_destination));
+	struct path_source      *new_ps = (struct path_source *) alloc(sizeof(struct path_source));
 
 	new_pd->node     = orig_ps->node;
 
@@ -754,8 +754,8 @@ int path_reverse(struct path *p, struct path *r)
 	list_push(&r->sources, new_ps);
 
 	for (size_t i = 0; i < list_length(&p->hooks); i++) {
-		struct hook *h = list_at(&p->hooks, i);
-		struct hook *g = alloc(sizeof(struct hook));
+		struct hook *h = (struct hook *) list_at(&p->hooks, i);
+		struct hook *g = (struct hook *) alloc(sizeof(struct hook));
 
 		ret = hook_init(g, h->_vt, r, NULL);
 		if (ret)
diff --git a/lib/plugin.c b/lib/plugin.c
index cbeb5da00..e26b19d83 100644
--- a/lib/plugin.c
+++ b/lib/plugin.c
@@ -90,7 +90,7 @@ int plugin_destroy(struct plugin *p)
 struct plugin * plugin_lookup(enum plugin_type type, const char *name)
 {
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *p = list_at(&plugins, i);
+		struct plugin *p = (struct plugin *) list_at(&plugins, i);
 
 		if (p->type == type && strcmp(p->name, name) == 0)
 			return p;
@@ -102,7 +102,7 @@ struct plugin * plugin_lookup(enum plugin_type type, const char *name)
 void plugin_dump(enum plugin_type type)
 {
 	for (size_t i = 0; i < list_length(&plugins); i++) {
-		struct plugin *p = list_at(&plugins, i);
+		struct plugin *p = (struct plugin *) list_at(&plugins, i);
 
 		if (p->type == type)
 			printf(" - %-13s: %s\n", p->name, p->description);
diff --git a/lib/queue.c b/lib/queue.c
index 2ca6c86c1..7d62cad00 100644
--- a/lib/queue.c
+++ b/lib/queue.c
@@ -49,7 +49,7 @@ int queue_init(struct queue *q, size_t size, struct memtype *mem)
 
 	q->mem = mem;
 	q->buffer_mask = size - 1;
-	struct queue_cell* buffer = memory_alloc(q->mem, sizeof(struct queue_cell) * size);
+	struct queue_cell *buffer = (struct queue_cell *) memory_alloc(q->mem, sizeof(struct queue_cell) * size);
 	if (!buffer)
 		return -2;
 
diff --git a/lib/super_node.c b/lib/super_node.c
index 7bc8b1926..b366b22c2 100644
--- a/lib/super_node.c
+++ b/lib/super_node.c
@@ -219,7 +219,7 @@ int super_node_parse_json(struct super_node *sn, json_t *cfg)
 		size_t index;
 		json_t *json_plugin;
 		json_array_foreach(json_plugins, index, json_plugin) {
-			struct plugin *p = alloc(sizeof(struct plugin));
+			struct plugin *p = (struct plugin *) alloc(sizeof(struct plugin));
 
 			ret = plugin_init(p);
 			if (ret)
@@ -252,7 +252,7 @@ int super_node_parse_json(struct super_node *sn, json_t *cfg)
 			if (!p)
 				error("Invalid node type: %s", type);
 
-			struct node *n = alloc(sizeof(struct node));
+			struct node *n = (struct node *) alloc(sizeof(struct node));
 
 			ret = node_init(n, &p->node);
 			if (ret)
@@ -274,7 +274,7 @@ int super_node_parse_json(struct super_node *sn, json_t *cfg)
 		size_t index;
 		json_t *json_path;
 		json_array_foreach(json_paths, index, json_path) {
-			struct path *p = alloc(sizeof(struct path));
+			struct path *p = (struct path *) alloc(sizeof(struct path));
 
 			ret = path_init(p);
 			if (ret)
@@ -287,7 +287,7 @@ int super_node_parse_json(struct super_node *sn, json_t *cfg)
 			list_push(&sn->paths, p);
 
 			if (p->reverse) {
-				struct path *r = alloc(sizeof(struct path));
+				struct path *r = (struct path *) alloc(sizeof(struct path));
 
 				ret = path_init(r);
 				if (ret)
@@ -314,7 +314,7 @@ int super_node_check(struct super_node *sn)
 	assert(sn->state != STATE_DESTROYED);
 
 	for (size_t i = 0; i < list_length(&sn->nodes); i++) {
-		struct node *n = list_at(&sn->nodes, i);
+		struct node *n = (struct node *) list_at(&sn->nodes, i);
 
 		ret = node_check(n);
 		if (ret)
@@ -322,7 +322,7 @@ int super_node_check(struct super_node *sn)
 	}
 
 	for (size_t i = 0; i < list_length(&sn->paths); i++) {
-		struct path *p = list_at(&sn->paths, i);
+		struct path *p = (struct path *) list_at(&sn->paths, i);
 
 		ret = path_check(p);
 		if (ret)
@@ -353,7 +353,7 @@ int super_node_start(struct super_node *sn)
 
 	info("Starting node-types");
 	for (size_t i = 0; i < list_length(&sn->nodes); i++) { INDENT
-		struct node *n = list_at(&sn->nodes, i);
+		struct node *n = (struct node *) list_at(&sn->nodes, i);
 
 		ret = node_type_start(n->_vt, sn);
 		if (ret)
@@ -362,7 +362,7 @@ int super_node_start(struct super_node *sn)
 
 	info("Starting nodes");
 	for (size_t i = 0; i < list_length(&sn->nodes); i++) { INDENT
-		struct node *n = list_at(&sn->nodes, i);
+		struct node *n = (struct node *) list_at(&sn->nodes, i);
 
 		int refs = list_count(&sn->paths, (cmp_cb_t) path_uses_node, n);
 		if (refs > 0) { INDENT
@@ -380,7 +380,7 @@ int super_node_start(struct super_node *sn)
 
 	info("Starting paths");
 	for (size_t i = 0; i < list_length(&sn->paths); i++) { INDENT
-		struct path *p = list_at(&sn->paths, i);
+		struct path *p = (struct path *) list_at(&sn->paths, i);
 
 		if (p->enabled) { INDENT
 			ret = path_init2(p);
@@ -406,7 +406,7 @@ int super_node_stop(struct super_node *sn)
 
 	info("Stopping paths");
 	for (size_t i = 0; i < list_length(&sn->paths); i++) { INDENT
-		struct path *p = list_at(&sn->paths, i);
+		struct path *p = (struct path *) list_at(&sn->paths, i);
 
 		ret = path_stop(p);
 		if (ret)
@@ -415,7 +415,7 @@ int super_node_stop(struct super_node *sn)
 
 	info("Stopping nodes");
 	for (size_t i = 0; i < list_length(&sn->nodes); i++) { INDENT
-		struct node *n = list_at(&sn->nodes, i);
+		struct node *n = (struct node *) list_at(&sn->nodes, i);
 
 		ret = node_stop(n);
 		if (ret)
@@ -424,7 +424,7 @@ int super_node_stop(struct super_node *sn)
 
 	info("Stopping node-types");
 	for (size_t i = 0; i < list_length(&plugins); i++) { INDENT
-		struct plugin *p = list_at(&plugins, i);
+		struct plugin *p = (struct plugin *) list_at(&plugins, i);
 
 		if (p->type == PLUGIN_TYPE_NODE) {
 			ret = node_type_stop(&p->node);
diff --git a/src/fpga-bench.c b/src/fpga-bench.c
index 30ff939a0..a4c821ee0 100644
--- a/src/fpga-bench.c
+++ b/src/fpga-bench.c
@@ -98,7 +98,7 @@ int fpga_benchmark_jitter(struct fpga_card *c)
 	if (!ip || !c->intc)
 		return -1;
 
-	struct timer *tmr = ip->_vd;
+	struct timer *tmr = (struct timer *) ip->_vd;
 
 	XTmrCtr *xtmr = &tmr->inst;
 
diff --git a/src/node.c b/src/node.c
index 4cce57a34..fae014428 100644
--- a/src/node.c
+++ b/src/node.c
@@ -174,26 +174,26 @@ int main(int argc, char *argv[])
 			task_wait(&t);
 
 			for (size_t i = 0; i < list_length(&sn.paths); i++) {
-				struct path *p = list_at(&sn.paths, i);
+				struct path *p = (struct path *) list_at(&sn.paths, i);
 
 				if (p->state != STATE_STARTED)
 					continue;
 
 				for (size_t j = 0; j < list_length(&p->hooks); j++) {
-					struct hook *h = list_at(&p->hooks, j);
+					struct hook *h = (struct hook *) list_at(&p->hooks, j);
 
 					hook_periodic(h);
 				}
 			}
 
 			for (size_t i = 0; i < list_length(&sn.nodes); i++) {
-				struct node *n = list_at(&sn.nodes, i);
+				struct node *n = (struct node *) list_at(&sn.nodes, i);
 
 				if (n->state != STATE_STARTED)
 					continue;
 
 				for (size_t j = 0; j < list_length(&n->hooks); j++) {
-					struct hook *h = list_at(&n->hooks, j);
+					struct hook *h = (struct hook *) list_at(&n->hooks, j);
 
 					hook_periodic(h);
 				}
diff --git a/src/test-rtt.c b/src/test-rtt.c
index 5548d7ead..a37a12084 100644
--- a/src/test-rtt.c
+++ b/src/test-rtt.c
@@ -148,8 +148,8 @@ void test_rtt() {
 
 	struct timespec send, recv;
 
-	struct sample *smp_send = alloc(SAMPLE_LEN(2));
-	struct sample *smp_recv = alloc(SAMPLE_LEN(2));
+	struct sample *smp_send = (struct sample *) alloc(SAMPLE_LEN(2));
+	struct sample *smp_recv = (struct sample *) alloc(SAMPLE_LEN(2));
 
 	hist_init(&hist, 20, 100);
 
diff --git a/tests/unit/advio.c b/tests/unit/advio.c
index a74bf96fe..a596ecc16 100644
--- a/tests/unit/advio.c
+++ b/tests/unit/advio.c
@@ -89,7 +89,7 @@ Test(advio, download_large)
 	AFILE *af;
 	int ret, len = 16;
 
-	struct sample *smp = alloc(SAMPLE_LEN(len));
+	struct sample *smp = (struct sample *) alloc(SAMPLE_LEN(len));
 	smp->capacity = len;
 
 	af = afopen(BASE_URI "/download-large" , "r");
diff --git a/tests/unit/fpga.c b/tests/unit/fpga.c
index a7703eec3..979ada327 100644
--- a/tests/unit/fpga.c
+++ b/tests/unit/fpga.c
@@ -125,7 +125,7 @@ Test(fpga, xsg, .description = "XSG: multiply_add")
 	dma = fpga_vlnv_lookup(&card->ips, &(struct fpga_vlnv) { "xilinx.com", "ip", "axi_dma", NULL });
 	cr_assert(dma);
 
-	struct model *model = ip->_vd;
+	struct model *model = (struct model *) ip->_vd;
 
 	p = list_lookup(&model->parameters, "factor");
 	if (!p)
@@ -265,12 +265,12 @@ Test(fpga, dma, .description = "DMA")
 	struct dma_mem mem, src, dst;
 
 	for (size_t i = 0; i < list_length(&card->ips); i++) { INDENT
-		struct fpga_ip *dm = list_at(&card->ips, i);
+		struct fpga_ip *dm = (struct fpga_ip *) list_at(&card->ips, i);
 
 		if (fpga_vlnv_cmp(&dm->vlnv, &(struct fpga_vlnv) { "xilinx.com", "ip", "axi_dma", NULL }))
 			continue; /* skip non DMA IP cores */
 
-		struct dma *dma = dm->_vd;
+		struct dma *dma = (struct dma *) dm->_vd;
 
 		/* Simple DMA can only transfer up to 4 kb due to
 		 * PCIe page size burst limitation */
@@ -326,7 +326,7 @@ Test(fpga, timer, .description = "Timer Counter")
 	ip = fpga_vlnv_lookup(&card->ips, &(struct fpga_vlnv) { "xilinx.com", "ip", "axi_timer", NULL });
 	cr_assert(ip);
 
-	tmr = ip->_vd;
+	tmr = (struct timer *) ip->_vd;
 
 	XTmrCtr *xtmr = &tmr->inst;