diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index 0a06759..102869c 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -146,7 +146,7 @@
 		/* Guard timer has expired, close connection */
 		[] T.timeout {
 			BSSAP.send(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_REQ);
-			setverdict(inconc);
+			setverdict(fail, "Timeout of guard timer");
 			self.stop;
 			}