diff --git a/Gruntfile.js b/Gruntfile.js
index c4c3ced58f..d350ce3ad6 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -193,6 +193,8 @@ module.exports = function (grunt) {
 
     validation: {
       options: {
+        charset: 'utf-8',
+        doctype: 'HTML5',
         reset: true,
         relaxerror: [
           'Bad value X-UA-Compatible for attribute http-equiv on element meta.',