diff --git a/src/monaco/env.ts b/src/monaco/env.ts
index 53593a01..63879ac9 100644
--- a/src/monaco/env.ts
+++ b/src/monaco/env.ts
@@ -131,6 +131,12 @@ export async function reloadVue(store: Store) {
   }
 }
 
+export interface WorkerMessage {
+  event: 'init'
+  tsVersion: string
+  tsLocale?: string
+}
+
 export function loadMonacoEnv(store: Store) {
   ;(self as any).MonacoEnvironment = {
     async getWorker(_: any, label: string) {
@@ -142,7 +148,11 @@ export function loadMonacoEnv(store: Store) {
               resolve()
             }
           })
-          worker.postMessage({ event: 'init', tsVersion: store.state.typescriptVersion })
+          worker.postMessage({
+            event: 'init',
+            tsVersion: store.state.typescriptVersion,
+            tsLocale: store.state.typescriptLocale,
+          } satisfies WorkerMessage)
         })
         await init
         return worker
diff --git a/src/monaco/vue.worker.ts b/src/monaco/vue.worker.ts
index 61777a77..75b90aac 100644
--- a/src/monaco/vue.worker.ts
+++ b/src/monaco/vue.worker.ts
@@ -12,7 +12,7 @@ import {
   createLanguageHost,
   createServiceEnvironment,
 } from '@volar/monaco/worker'
-import type { WorkerHost } from './env'
+import type { WorkerHost, WorkerMessage } from './env'
 
 export interface CreateData {
   tsconfig: {
@@ -22,22 +22,28 @@ export interface CreateData {
   dependencies: {}
 }
 
-const locale = navigator.language.toLowerCase()
+let locale: string
 
 let ts: typeof import('typescript')
 let tsLocalized: any
 
-self.onmessage = async (msg) => {
+self.onmessage = async (msg: MessageEvent<WorkerMessage>) => {
   if (msg.data?.event === 'init') {
+    if (msg.data.tsLocale) {
+      locale = msg.data.tsLocale
+    }
+
     ;[ts, tsLocalized] = await Promise.all([
       importTsFromCdn(msg.data.tsVersion),
-      fetchJson(
-        `https://cdn.jsdelivr.net/npm/typescript@${msg.data.tsVersion}/lib/${locale}/diagnosticMessages.generated.json`
-      ),
+      locale &&
+        fetchJson(
+          `https://cdn.jsdelivr.net/npm/typescript@${msg.data.tsVersion}/lib/${locale}/diagnosticMessages.generated.json`
+        ),
     ])
     self.postMessage('inited')
     return
   }
+
   worker.initialize(
     (
       ctx: monaco.worker.IWorkerContext<WorkerHost>,
diff --git a/src/store.ts b/src/store.ts
index 1b0518c9..422b245e 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -86,6 +86,7 @@ export interface StoreState {
   vueRuntimeURL: string
   vueServerRendererURL: string
   typescriptVersion: string
+  typescriptLocale: string | undefined
   // used to force reset the sandbox
   resetFlip: boolean
 }
@@ -168,6 +169,7 @@ export class ReplStore implements Store {
       vueRuntimeURL: this.defaultVueRuntimeURL,
       vueServerRendererURL: this.defaultVueServerRendererURL,
       typescriptVersion: 'latest',
+      typescriptLocale: undefined,
       resetFlip: true,
     })
 
@@ -187,6 +189,7 @@ export class ReplStore implements Store {
       () => [
         this.state.files[tsconfigFile]?.code,
         this.state.typescriptVersion,
+        this.state.typescriptLocale,
       ],
       () => reloadVue(this)
     )