diff --git a/packages/core/sdk/src/APIClient.ts b/packages/core/sdk/src/APIClient.ts
index b0fce5a40e..32ddf1311a 100644
--- a/packages/core/sdk/src/APIClient.ts
+++ b/packages/core/sdk/src/APIClient.ts
@@ -125,7 +125,7 @@ export class Auth {
    * use {@link Auth#locale} instead
    */
   getLocale() {
-    return this.getOption('locale') || 'en-US';
+    return this.getOption('locale');
   }
 
   /**
diff --git a/packages/plugins/@nocobase/plugin-field-markdown-vditor/src/client/components/Edit.tsx b/packages/plugins/@nocobase/plugin-field-markdown-vditor/src/client/components/Edit.tsx
index 475bab4232..51adb9b37b 100644
--- a/packages/plugins/@nocobase/plugin-field-markdown-vditor/src/client/components/Edit.tsx
+++ b/packages/plugins/@nocobase/plugin-field-markdown-vditor/src/client/components/Edit.tsx
@@ -28,7 +28,7 @@ export const Edit = withDynamicSchemaProps((props) => {
   const apiClient = useAPIClient();
   const cdn = useCDN();
   const { wrapSSR, hashId, componentCls: containerClassName } = useStyle();
-  const locale = apiClient.auth.locale;
+  const locale = apiClient.auth.locale || 'en-US';
 
   const lang: any = useMemo(() => {
     const currentLang = locale.replace(/-/g, '_');