diff --git a/plugins/plugin-shikiji/__test__/copyCodeButton.spec.ts b/plugins/plugin-shikiji/__test__/copyCodeButton.spec.ts
index e3afd563..88003d3b 100644
--- a/plugins/plugin-shikiji/__test__/copyCodeButton.spec.ts
+++ b/plugins/plugin-shikiji/__test__/copyCodeButton.spec.ts
@@ -13,7 +13,7 @@ function createMarkdown(options: boolean | CopyCodeOptions = {}, lang = 'en-US')
     env: { isDebug: false },
     siteData: {
       lang,
-      locales: { '/': { lang }, '/zh/': { lang: 'zh-CN' }, '/en/': { lang: 'en-US' } },
+      locales: { '/': { lang }, '/zh/': { lang: 'zh-CN' }, '/en/': { lang: 'en-US' }, '/xxx/': { lang: 'unknown' } },
     },
   } as unknown as App
   copyCodeButtonPlugin(md, app, options)
diff --git a/plugins/plugin-shikiji/src/node/copy-code-button/createCopyCodeButtonRender.ts b/plugins/plugin-shikiji/src/node/copy-code-button/createCopyCodeButtonRender.ts
index a3925c67..f965ce15 100644
--- a/plugins/plugin-shikiji/src/node/copy-code-button/createCopyCodeButtonRender.ts
+++ b/plugins/plugin-shikiji/src/node/copy-code-button/createCopyCodeButtonRender.ts
@@ -32,7 +32,7 @@ export function createCopyCodeButtonRender(app: App, options?: boolean | CopyCod
   return (filePathRelative: string) => {
     const relativePath = ensureLeadingSlash(filePathRelative)
     const localePath = resolveLocalePath(locales, relativePath)
-    const { title, copied } = locales[localePath]
+    const { title, copied } = locales[localePath] || locales['/']
 
     return `<button class="${className}" title="${title}" data-copied="${copied}"></button>`
   }