diff --git a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
index 7b3402ce6d..f1e37fff7b 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
@@ -374,7 +374,7 @@ class ResponseTest extends ResponseTestCase
         $response->prepare($request);
 
         $this->assertEquals('', $response->getContent());
-        $this->assertFalse($response->headers->has('Content-Type'));
+        $this->assertTrue($response->headers->has('Content-Type'));
         $this->assertFalse($response->headers->has('Content-Length'));
     }