diff --git a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
index 3a084954c4430..6efae35e9a782 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
@@ -361,9 +361,12 @@ public function testPrepareRemovesContentForHeadRequests()
         $response = new Response('foo');
         $request = Request::create('/', 'HEAD');
 
+        $length = 12345;
+        $response->headers->set('Content-Length', $length);
         $response->prepare($request);
 
         $this->assertEquals('', $response->getContent());
+        $this->assertEquals($length, $response->headers->get('Content-Length'), 'Content-Length should be as if it was GET; see RFC2616 14.13');
     }
 
     public function testPrepareSetsPragmaOnHttp10Only()