diff --git a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
index 97021c8a46005..0b9e218ee408b 100644
--- a/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/WebProfilerBundle/Controller/ExceptionController.php
@@ -96,7 +96,7 @@ public function cssAction($token)
             return new Response($handler->getStylesheet($exception));
         }
 
-        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()