diff --git a/src/DependencyInjection/ServiceContainer.php b/src/DependencyInjection/ServiceContainer.php
index 0cf6023..3e856e6 100644
--- a/src/DependencyInjection/ServiceContainer.php
+++ b/src/DependencyInjection/ServiceContainer.php
@@ -45,7 +45,7 @@ public static function getInstance()
     /**
      * Load service container.
      */
-    public function load()
+    public function load($file = null)
     {
         $loader = new YamlFileLoader($this, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('config.yml');