diff --git a/openbsc/tests/mgcp/mgcp_test.c b/openbsc/tests/mgcp/mgcp_test.c
index 498a1d8..5388483 100644
--- a/openbsc/tests/mgcp/mgcp_test.c
+++ b/openbsc/tests/mgcp/mgcp_test.c
@@ -177,6 +177,7 @@
 #define CRCX	 "CRCX 2 1@mgw MGCP 1.0\r\n"	\
 		 "M: recvonly\r\n"		\
 		 "C: 2\r\n"			\
+		 "X\r\n"			\
 		 "L: p:20\r\n"		\
 		 "\r\n"				\
 		 "v=0\r\n"			\