diff --git a/openbsc/include/openbsc/osmo_msc_data.h b/openbsc/include/openbsc/osmo_msc_data.h
index d3f8474..4205c15 100644
--- a/openbsc/include/openbsc/osmo_msc_data.h
+++ b/openbsc/include/openbsc/osmo_msc_data.h
@@ -51,5 +51,6 @@
 };
 
 int osmo_bsc_msc_init(struct gsm_network *network);
+int msc_queue_write(struct bsc_msc_connection *conn, struct msgb *msg, int proto);
 
 #endif