diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
index 6d10ab641b72d..fafd985ec3fe2 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
@@ -84,10 +84,10 @@ public function cssAction($token)
         if (!$this->templateExists($template)) {
             $handler = new ExceptionHandler();
 
-            return new Response($handler->getStylesheet($exception));
+            return new Response($handler->getStylesheet($exception), 200, array('Content-Type' => 'text/css'));
         }
 
-        return new Response($this->twig->render('@WebProfiler/Collector/exception.css.twig'), 200, 'text/css');
+        return new Response($this->twig->render('@WebProfiler/Collector/exception.css.twig'), 200, array('Content-Type' => 'text/css'));
     }
 
     protected function getTemplate()
diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 6913a5d031d2c..de7a694e9471e 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -135,7 +135,7 @@ class Response
      *
      * @api
      */
-    public function __construct($content = '', $status = 200, $headers = array())
+    public function __construct($content = '', $status = 200, array $headers = array())
     {
         $this->headers = new ResponseHeaderBag($headers);
         $this->setContent($content);