diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index a8a2b71c1322d..ad9f6ecb7ce67 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -851,6 +851,7 @@ protected function dumpContainer(ConfigCache $cache, ContainerBuilder $container
             $fs->dumpFile($dir.$file, $code);
             @chmod($dir.$file, 0666 & ~umask());
         }
+        @unlink(dirname($dir.$file).'.legacy');
 
         $cache->write($rootCode, $container->getResources());
     }