diff --git a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
index 8455baafc7..57ff1c7c40 100644
--- a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
+++ b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
@@ -23,7 +23,7 @@ use Symfony\Component\HttpFoundation\Response;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class HttpCache extends BaseHttpCache
+abstract class HttpCache extends BaseHttpCache
 {
     protected $cacheDir;
     protected $kernel;