diff --git a/include/villas/node.h b/include/villas/node.h
index f4b35dc1b..f620f2ea8 100644
--- a/include/villas/node.h
+++ b/include/villas/node.h
@@ -198,9 +198,13 @@ struct vlist * node_input_signals(struct vnode *n);
  */
 int node_reverse(struct vnode *n);
 
-int node_read(struct vnode *n, struct sample * smps[], unsigned cnt);
+int node_read(struct vnode *n, struct sample *smps[], unsigned cnt);
 
-int node_write(struct vnode *n, struct sample * smps[], unsigned cnt, bool clone_if_modified = false);
+int node_write(struct vnode *n, struct sample *smps[], unsigned cnt);
+
+int node_read(struct vnode *n, struct sample *smp);
+
+int node_write(struct vnode *n, struct sample *smp);
 
 int node_poll_fds(struct vnode *n, int fds[]);
 
diff --git a/lib/node.cpp b/lib/node.cpp
index ffc55c53a..b10a5b11a 100644
--- a/lib/node.cpp
+++ b/lib/node.cpp
@@ -721,3 +721,13 @@ json_t * node_to_json(struct vnode *n)
 
 	return json_node;
 }
+
+int node_read(struct vnode *n, struct sample *smp)
+{
+	return node_read(n, &smp, 1);
+}
+
+int node_write(struct vnode *n, struct sample *smp)
+{
+	return node_write(n, &smp, 1);
+}
diff --git a/src/villas-test-rtt.cpp b/src/villas-test-rtt.cpp
index fa806e2ae..ccf64f2ec 100644
--- a/src/villas-test-rtt.cpp
+++ b/src/villas-test-rtt.cpp
@@ -206,8 +206,8 @@ check:			if (optarg == endptr)
 		while (!stop && (count < 0 || count--)) {
 			clock_gettime(CLOCK_ID, &send);
 
-			node_write(node, &smp_send, 1); /* Ping */
-			node_read(node,  &smp_recv, 1); /* Pong */
+			node_write(node, smp_send); /* Ping */
+			node_read(node,  smp_recv); /* Pong */
 
 			clock_gettime(CLOCK_ID, &recv);