diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index f21a88b3b44d4..dda645a6fca2e 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -556,7 +556,7 @@ public function write($content, array $metadata = null)
                             }
                         }
 
-                        public function __destruct()
+                        public function release()
                         {
                             flock($this->lock, LOCK_UN);
                             fclose($this->lock);
@@ -634,7 +634,7 @@ public function __destruct()
         }
 
         $this->dumpContainer($cache, $container, $class, $this->getContainerBaseClass());
-        unset($cache);
+        $cache->release();
         $this->container = require $cachePath;
         $this->container->set('kernel', $this);