diff --git a/bsc-nat/BSC_MS_ConnectionHandler.ttcn b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
index e52b678..28ff349 100644
--- a/bsc-nat/BSC_MS_ConnectionHandler.ttcn
+++ b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
@@ -54,6 +54,7 @@
 	decode_dtap := false,
 	role_ms := true,
 	protocol := RAN_PROTOCOL_BSSAP,
+	use_osmux := false,
 	sccp_addr_local := omit,
 	sccp_addr_peer := omit
 }