diff --git a/Block/Adminhtml/System/Config/Form/Field/Less.php b/Block/Adminhtml/System/Config/Form/Field/Less.php
index 21dc288..91d6f67 100644
--- a/Block/Adminhtml/System/Config/Form/Field/Less.php
+++ b/Block/Adminhtml/System/Config/Form/Field/Less.php
@@ -9,6 +9,6 @@ class Less extends Css
      */
     public function getMode()
     {
-        return 'javascript';
+        return 'text/x-less';
     }
 }