diff --git a/framework/core/src/User/User.php b/framework/core/src/User/User.php
index f9ea41756e..cc1ac95c8f 100644
--- a/framework/core/src/User/User.php
+++ b/framework/core/src/User/User.php
@@ -650,7 +650,7 @@ public function assertCan($ability, $arguments = null)
      */
     public function assertAdmin()
     {
-        $this->assertCan($this, 'administrate');
+        $this->assertCan('administrate');
     }
 
     /**