diff --git a/std/living/comm.c b/std/living/comm.c
index 59749a3..61c5b70 100644
--- a/std/living/comm.c
+++ b/std/living/comm.c
@@ -163,7 +163,7 @@
 }
 
 public int ReceiveMultiSense(struct wave_s *msgs,
-    string action = 0, int commontypes = 0)
+    string action = comm_guess_action(), int commontypes = 0)
 {
   int res;
   foreach(struct wave_s wave : msgs)