diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index 47cfb0bf65b..72a422ac1f4 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -2261,7 +2261,7 @@ 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;