diff --git a/openbsc/include/openbsc/osmo_bsc.h b/openbsc/include/openbsc/osmo_bsc.h
index 30e6439..202cc44 100644
--- a/openbsc/include/openbsc/osmo_bsc.h
+++ b/openbsc/include/openbsc/osmo_bsc.h
@@ -16,5 +16,6 @@
 			      struct msgb *msg, uint16_t chosen_channel);
 
 int bsc_scan_bts_msg(struct gsm_subscriber_connection *conn, struct msgb *msg);
+int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg);
 
 #endif
diff --git a/openbsc/src/bsc/osmo_bsc_filter.c b/openbsc/src/bsc/osmo_bsc_filter.c
index 7052cfe..965b7c5 100644
--- a/openbsc/src/bsc/osmo_bsc_filter.c
+++ b/openbsc/src/bsc/osmo_bsc_filter.c
@@ -66,3 +66,11 @@
 
 	return 0;
 }
+
+/**
+ * Messages coming back from the MSC.
+ */
+int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
+{
+	return 0;
+}