diff --git a/docs/src/util.ts b/docs/src/util.ts
index 53752077e..0ec91bce0 100644
--- a/docs/src/util.ts
+++ b/docs/src/util.ts
@@ -1,4 +1,4 @@
 export function getLanguageFromURL(pathname: string) {
-  const langCodeMatch = pathname.match(/\/([a-z]{2})\//);
+  const langCodeMatch = pathname.match(/\/([a-z]{2}-?[A-Z]{0,2})\//);
   return langCodeMatch ? langCodeMatch[1] : 'en';
 }