diff --git a/src/modules/module-adapter/adapter.c b/src/modules/module-adapter/adapter.c
index 307d3929c..99f85497d 100644
--- a/src/modules/module-adapter/adapter.c
+++ b/src/modules/module-adapter/adapter.c
@@ -128,7 +128,7 @@ static void node_port_init(void *data, struct pw_impl_port *port)
 
 	if ((str = pw_properties_get(old, PW_KEY_AUDIO_CHANNEL)) == NULL ||
 	    strcmp(str, "UNK") == 0) {
-		snprintf(position, sizeof(position), "%d", pw_impl_port_get_id(port));
+		snprintf(position, sizeof(position), "%d", pw_impl_port_get_id(port) + 1);
 		str = position;
 	}
 	if (direction == n->direction) {