diff --git a/src/generate/dayjs.ts b/src/generate/dayjs.ts
index 160fc0a6b..4225c94dc 100644
--- a/src/generate/dayjs.ts
+++ b/src/generate/dayjs.ts
@@ -35,7 +35,7 @@ const localeMap: IlocaleMapObject = {
 
 const parseLocale = (locale: string) => {
   const mapLocale = localeMap[locale];
-  return (mapLocale || locale.split('_')[0]) as LocalePresetType;
+  return mapLocale || locale.split('_')[0];
 };
 
 const parseNoMatchNotice = () => {