diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index c21e4c789c..e7a9779bec 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -2161,17 +2161,6 @@ class upgradeModel extends model
         return $this->app->getTmpRoot() . 'log/upgrade.' . date('Ymd') . '.log.php';
     }
 
-    /**
-     * Check safe file.
-     *
-     * @access public
-     * @return string|false
-     */
-    public function checkSafeFile()
-    {
-        return $this->loadModel('common')->checkSafeFile();
-    }
-
     /**
      * Check weither process or not.
      *