diff --git a/app/Http/Middleware/Localize.php b/app/Http/Middleware/Localize.php
index 5beffc4f51f3..0ef76f00100a 100644
--- a/app/Http/Middleware/Localize.php
+++ b/app/Http/Middleware/Localize.php
@@ -58,7 +58,7 @@ public function handle($request, Closure $next)
         $userLanguage = $this->config->get('app.locale');
 
         foreach ($supportedLanguages as $language) {
-            $language = substr($language, 0, 2);
+            $language = str_replace('_', '-', $language);
 
             if (isset($this->langs[$language])) {
                 $userLanguage = $language;