diff --git a/contrib/postgres_fdw/connection.c b/contrib/postgres_fdw/connection.c
index 3df86d1d0c07bcf5d1a5f4b7b4c19b62960a520b..189f290cdf6a94b309042822f26a80986ef78b6c 100644
--- a/contrib/postgres_fdw/connection.c
+++ b/contrib/postgres_fdw/connection.c
@@ -159,7 +159,7 @@ GetConnection(UserMapping *user, bool will_prep_stmt)
 		entry->have_error = false;
 		entry->conn = connect_pg_server(server, user);
 
-		elog(DEBUG3, "new postgres_fdw connection %p for server \"%s\" (user mapping oid %d, userid %d)",
+		elog(DEBUG3, "new postgres_fdw connection %p for server \"%s\" (user mapping oid %u, userid %u)",
 			 entry->conn, server->servername, user->umid, user->userid);
 	}