diff --git a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
index 3f4178f307..77b4ee3363 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
@@ -445,6 +445,8 @@ class ResponseTest extends ResponseTestCase
         $response->setStatusCode(101);
         $response->prepare($request);
         $this->assertEquals('', $response->getContent());
+        $this->assertFalse($response->headers->has('Content-Type'));
+        $this->assertFalse($response->headers->has('Content-Length'));
 
         $response->setContent('content');
         $response->setStatusCode(304);