diff --git a/src/Symfony/Component/Workflow/EventListener/GuardListener.php b/src/Symfony/Component/Workflow/EventListener/GuardListener.php
index d78ae47396..e0c29876af 100644
--- a/src/Symfony/Component/Workflow/EventListener/GuardListener.php
+++ b/src/Symfony/Component/Workflow/EventListener/GuardListener.php
@@ -56,7 +56,7 @@ class GuardListener
     {
         $token = $this->tokenStorage->getToken();
 
-        if ($token == null) {
+        if (null === $token) {
             $token = new AnonymousToken('secret', 'anon', array());
             $this->tokenStorage->setToken($token);
         }