diff --git a/lib/utils/language.js b/lib/utils/language.js
index 5364d22..572c2be 100644
--- a/lib/utils/language.js
+++ b/lib/utils/language.js
@@ -61,6 +61,7 @@ define(['polyglot', 'moment', 'helper'], function (Polyglot, moment, helper) {
       router = r;
       window._ = new Polyglot({ locale: getLocale(router.getLang()), allowMissing: true });
       helper.getJSON('locale/' + _.locale() + '.json?' + config.cacheBreaker).then(setTranslation);
+      document.querySelector('html').setAttribute('lang', _.locale());
     }
 
     return {