diff --git a/StorageBundle/DependencyInjection/StorageExtension.php b/StorageBundle/DependencyInjection/StorageExtension.php
index bb58d66..0267197 100644
--- a/StorageBundle/DependencyInjection/StorageExtension.php
+++ b/StorageBundle/DependencyInjection/StorageExtension.php
@@ -7,9 +7,10 @@ use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Extension\Extension;
+use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
-class StorageExtension extends Extension
+class StorageExtension extends Extension implements PrependExtensionInterface
 {
 
     /**