diff --git a/library/includes/init_bb.php b/library/includes/init_bb.php
index e56a7bdc9..eb00cfa86 100644
--- a/library/includes/init_bb.php
+++ b/library/includes/init_bb.php
@@ -145,7 +145,6 @@ define('SEARCH_TYPE_TRACKER', 1);
 // Ajax error codes
 define('E_AJAX_GENERAL_ERROR', 1000);
 define('E_AJAX_NEED_LOGIN', 1001);
-define('E_AJAX_NOT_REQUEST', 1002);
 
 // Private messaging
 define('PRIVMSGS_READ_MAIL', 0);
diff --git a/src/Ajax.php b/src/Ajax.php
index 2df39c93c..abb505895 100644
--- a/src/Ajax.php
+++ b/src/Ajax.php
@@ -75,13 +75,10 @@ class Ajax
         // Check that requested action is valid
         $action = $this->action;
 
-        // Action params
+        // Actions params array
         $action_params = null;
 
-        if (!IsHelper::isAJAX()) {
-            $this->ajax_die('Not AJAX request', E_AJAX_NOT_REQUEST);
-        }
-
+        // Actions check
         if (!$action) {
             $this->ajax_die('no action specified');
         } elseif (!$action_params =& $this->valid_actions[$action]) {
diff --git a/src/Helpers/IsHelper.php b/src/Helpers/IsHelper.php
index fa81566bc..45001c9cb 100644
--- a/src/Helpers/IsHelper.php
+++ b/src/Helpers/IsHelper.php
@@ -31,16 +31,6 @@ class IsHelper
         return $_is_php[$version];
     }
 
-    /**
-     * Return true if ajax request
-     *
-     * @return bool
-     */
-    public static function isAJAX(): bool
-    {
-        return (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');
-    }
-
     /**
      * Return true if server have SSL
      *