diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index fe584c8a580..cebcd246e25 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -2259,7 +2259,7 @@ LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
 Oid
 LookupFuncWithArgs(ObjectType objtype, ObjectWithArgs *func, bool missing_ok)
 {
-	Oid			argoids[FUNC_MAX_ARGS];
+	Oid			argoids[FUNC_MAX_ARGS] = {0};
 	int			argcount;
 	int			nargs;
 	int			i;