diff --git a/lib/nodes/mqtt.c b/lib/nodes/mqtt.c
index df1bae3eb..bbe94b07a 100644
--- a/lib/nodes/mqtt.c
+++ b/lib/nodes/mqtt.c
@@ -130,7 +130,7 @@ int mqtt_parse(struct node *n, json_t *cfg)
 	struct mqtt *m = (struct mqtt *) n->_vd;
 
 	const char *host;
-	const char *format = "villas.human";
+	const char *format = "villas.binary";
 	const char *publish = NULL;
 	const char *subscribe = NULL;
 	const char *username = NULL;
diff --git a/lib/nodes/nanomsg.c b/lib/nodes/nanomsg.c
index 8d69cc4d8..575c584b0 100644
--- a/lib/nodes/nanomsg.c
+++ b/lib/nodes/nanomsg.c
@@ -82,7 +82,7 @@ int nanomsg_parse(struct node *n, json_t *cfg)
 	int ret;
 	struct nanomsg *m = (struct nanomsg *) n->_vd;
 
-	const char *format = "villas.human";
+	const char *format = "villas.binary";
 
 	json_error_t err;
 
diff --git a/lib/nodes/test_rtt.c b/lib/nodes/test_rtt.c
index 367785f7f..8514766dd 100644
--- a/lib/nodes/test_rtt.c
+++ b/lib/nodes/test_rtt.c
@@ -73,7 +73,7 @@ int test_rtt_parse(struct node *n, json_t *cfg)
 	int ret;
 	struct test_rtt *t = (struct test_rtt *) n->_vd;
 
-	const char *format = "villas.human";
+	const char *format = "villas.binary";
 	const char *output = ".";
 	const char *prefix = node_name_short(n);
 
diff --git a/lib/nodes/zeromq.c b/lib/nodes/zeromq.c
index 8425b56d8..bc27efdd8 100644
--- a/lib/nodes/zeromq.c
+++ b/lib/nodes/zeromq.c
@@ -100,7 +100,7 @@ int zeromq_parse(struct node *n, json_t *cfg)
 	const char *type = NULL;
 	const char *in_filter = NULL;
 	const char *out_filter = NULL;
-	const char *format = "villas.human";
+	const char *format = "villas.binary";
 
 	size_t i;
 	json_t *json_pub = NULL;