diff --git a/include/osmocom/mgcp_client/mgcp_client_internal.h b/include/osmocom/mgcp_client/mgcp_client_internal.h
index 44b9022..73e3de2 100644
--- a/include/osmocom/mgcp_client/mgcp_client_internal.h
+++ b/include/osmocom/mgcp_client/mgcp_client_internal.h
@@ -16,6 +16,7 @@
 	mgcp_trans_id_t next_trans_id;
 	struct llist_head responses_pending;
 	struct llist_head inuse_endpoints;
+	struct mgcp_client_pool *pool;
 };
 
 struct mgcp_inuse_endpoint {