diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index 66b4ff5..3b5c24e 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -1242,3 +1242,9 @@
 	printf("Testing execution completed.\n");
 	return 0;
 }
+
+/* stub */
+void bsc_nat_send_mgcp_to_msc(struct bsc_nat *nat, struct msgb *msg)
+{
+	abort();
+}