diff --git a/Gruntfile.js b/Gruntfile.js
index da5b743a0f..48dcf7fea5 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -359,7 +359,7 @@ module.exports = function (grunt) {
         tasks: ['jshint:test', 'qunit']
       },
       less: {
-        files: 'less/*.less',
+        files: 'less/**/*.less',
         tasks: 'less'
       }
     },