diff --git a/DependencyInjection/SyliusMailerExtension.php b/DependencyInjection/SyliusMailerExtension.php
index <HASH>..<HASH> 100644
--- a/DependencyInjection/SyliusMailerExtension.php
+++ b/DependencyInjection/SyliusMailerExtension.php
@@ -27,7 +27,7 @@ final class SyliusMailerExtension extends Extension
      */
     public function load(array $config, ContainerBuilder $container)
     {
-        $config = $this->processConfiguration($this->getConfiguration($config, $container), $config);
+        $config = $this->processConfiguration($this->getConfiguration([], $container), $config);
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
 
         $configFiles = [
Simplify getConfiguration() call in extensions