diff --git a/app/code/Magento/Backend/Controller/Adminhtml/Noroute/Index.php b/app/code/Magento/Backend/Controller/Adminhtml/Noroute/Index.php
index f03d58b9a3eb7..64038d17f14c6 100644
--- a/app/code/Magento/Backend/Controller/Adminhtml/Noroute/Index.php
+++ b/app/code/Magento/Backend/Controller/Adminhtml/Noroute/Index.php
@@ -8,6 +8,13 @@
 
 class Index extends \Magento\Backend\App\Action
 {
+    /**
+     * Array of actions which can be processed without secret key validation
+     *
+     * @var string[]
+     */
+    protected $_publicActions = ['index'];
+
     /**
      * @var \Magento\Framework\View\Result\PageFactory
      */