diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index 217c4f4..c3b86c0 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -89,6 +89,12 @@
 	0x05, 0x01, 0x02, 0x03, 0x00, 0x00, 0x03
 };
 
+/* MGCP wrap... */
+static const u_int8_t mgcp_msg[] = {
+	0x00, 0x03, 0xfc,
+	0x20, 0x20, 0x20,
+};
+
 struct filter_result {
 	const u_int8_t *data;
 	const u_int16_t length;
@@ -145,6 +151,12 @@
 		.dir = DIR_BSC,
 		.result = 0,
 	},
+	{
+		.data = mgcp_msg,
+		.length = ARRAY_SIZE(mgcp_msg),
+		.dir = DIR_MSC,
+		.result = 0,
+	},
 };
 
 static void test_filter(void)