diff --git a/include/villas/memory/ib.h b/include/villas/memory/ib.h
index 2f4597657..4b9996b67 100644
--- a/include/villas/memory/ib.h
+++ b/include/villas/memory/ib.h
@@ -28,4 +28,4 @@ struct memory_ib {
     struct memory_type *parent;
 };
 
-struct ibv_mr * memory_ib_get_mr(struct sample *smps);
+struct ibv_mr * memory_ib_get_mr(void *ptr);
diff --git a/include/villas/pool.h b/include/villas/pool.h
index 047ba0341..cb2ed0bbf 100644
--- a/include/villas/pool.h
+++ b/include/villas/pool.h
@@ -50,6 +50,7 @@ struct pool {
 };
 
 #define INLINE static inline __attribute__((unused))
+#define pool_buffer(p) ((char *) (p) + (p)->buffer_off)
 
 /** Initiazlize a pool
  *
diff --git a/lib/memory/ib.c b/lib/memory/ib.c
index 3a5f24da6..cae97f1ec 100644
--- a/lib/memory/ib.c
+++ b/lib/memory/ib.c
@@ -27,16 +27,14 @@
 #include <villas/utils.h>
 #include <villas/memory/ib.h>
 
-struct ibv_mr * memory_ib_get_mr(struct sample *smps)
+struct ibv_mr * memory_ib_get_mr(void *ptr)
 {
 	struct memory_allocation *ma;
-	struct pool *p;
 	struct ibv_mr *mr;
 
-	p = sample_pool(smps);
-
-	ma = memory_get_allocation((char *) (p) + p->buffer_off);
+	ma = memory_get_allocation(ptr);
 	mr = ma->ib.mr;
+
 	return mr;
 }
 
diff --git a/lib/nodes/infiniband.c b/lib/nodes/infiniband.c
index 258d0517c..f16d7ae05 100644
--- a/lib/nodes/infiniband.c
+++ b/lib/nodes/infiniband.c
@@ -803,7 +803,7 @@ int ib_read(struct node *n, struct sample *smps[], unsigned cnt, unsigned *relea
 		}
 
 		// Get Memory Region
-		mr = memory_ib_get_mr(smps[0]);
+		mr = memory_ib_get_mr( pool_buffer( sample_pool(smps[0]) ) );
 
 		for (int i = 0; i < max_wr_post; i++) {
 			int j = 0;
@@ -915,7 +915,7 @@ int ib_write(struct node *n, struct sample *smps[], unsigned cnt, unsigned *rele
 		// First, write
 
 		// Get Memory Region
-		mr = memory_ib_get_mr(smps[0]);
+		mr = memory_ib_get_mr( pool_buffer( sample_pool(smps[0]) ) );
 
 		for (sent = 0; sent < cnt; sent++) {
 			int j = 0;