diff --git a/www/index.html b/www/index.html
index 7dc3c555f913bad23877f29e7968b65e5722bc57..d2e25159e416a3bb76964c3455a6747d1f9add22 100644
--- a/www/index.html
+++ b/www/index.html
@@ -10,8 +10,9 @@
       const langs = ['fr', 'en'];
       const defLang = 'en';
       const userLangs = (navigator.languages || [navigator.language]).map(
-        a => a.split('-')[0],
+        a => a.split('-').shift(),
       );
+      userLangs.push(defLang);
       const selectedLang = userLangs.find(lang => langs.indexOf(lang) !== -1);
       document.location.replace(selectedLang);
     </script>