diff --git a/mandelstudio/middleware_language_redirect.py b/mandelstudio/middleware_language_redirect.py
index d203df2..ee78d0b 100644
--- a/mandelstudio/middleware_language_redirect.py
+++ b/mandelstudio/middleware_language_redirect.py
@@ -80,7 +80,10 @@ class FirstVisitLanguageRedirectMiddleware:
         matched = get_language_from_request(request, check_path=False)
         if matched:
             normalized = matched.split("-")[0].lower()
-            if normalized in self.supported_languages and normalized != self.default_language:
+            if (
+                normalized in self.supported_languages
+                and normalized != self.default_language
+            ):
                 return normalized
 
         # Fallback to raw Accept-Language parsing for unprefixed default routes.