diff --git a/include/osmocom/mgcp/mgcp_network.h b/include/osmocom/mgcp/mgcp_network.h
index 349ff94..a3d57f0 100644
--- a/include/osmocom/mgcp/mgcp_network.h
+++ b/include/osmocom/mgcp/mgcp_network.h
@@ -157,7 +157,7 @@
 			  struct mgcp_rtp_state *state,
 			  struct mgcp_rtp_end *rtp_end,
 			  struct osmo_sockaddr *addr, struct msgb *msg);
-void mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn);
+int mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn);
 
 /* payload processing default functions */
 int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end,