diff --git a/src/Symfony/Component/Security/Http/Firewall/LogoutListener.php b/src/Symfony/Component/Security/Http/Firewall/LogoutListener.php
index 69af6d819f3a6..6189cba4f384c 100644
--- a/src/Symfony/Component/Security/Http/Firewall/LogoutListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/LogoutListener.php
@@ -121,8 +121,7 @@ public function authenticate(RequestEvent $event)
         $logoutEvent = new LogoutEvent($request, $this->tokenStorage->getToken());
         $this->eventDispatcher->dispatch($logoutEvent);
 
-        $response = $logoutEvent->getResponse();
-        if (!$response instanceof Response) {
+        if (!$response = $logoutEvent->getResponse()) {
             throw new \RuntimeException('No logout listener set the Response, make sure at least the DefaultLogoutListener is registered.');
         }