diff --git a/contrib/lo/lo.c b/contrib/lo/lo.c
index 953659305fb..2b450b8ea8c 100644
--- a/contrib/lo/lo.c
+++ b/contrib/lo/lo.c
@@ -35,8 +35,7 @@ lo_manage(PG_FUNCTION_ARGS)
 	HeapTuple	trigtuple;		/* The original value of tuple	*/
 
 	if (!CALLED_AS_TRIGGER(fcinfo))		/* internal error */
-		elog(ERROR, "%s: not fired by trigger manager",
-			 trigdata->tg_trigger->tgname);
+		elog(ERROR, "lo_manage: not fired by trigger manager");
 
 	if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))		/* internal error */
 		elog(ERROR, "%s: must be fired for row",