diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index d56951153b..2ff6debebf 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -3899,6 +3899,14 @@ set_transmission_modes(void)
 								 PGC_USERSET, PGC_S_SESSION,
 								 GUC_ACTION_SAVE, true, 0, false);
 
+	/*
+	 * In addition force restrictive search_path, in case there are any
+	 * regproc or similar constants to be printed.
+	 */
+	(void) set_config_option("search_path", "pg_catalog",
+							 PGC_USERSET, PGC_S_SESSION,
+							 GUC_ACTION_SAVE, true, 0, false);
+
 	return nestlevel;
 }