diff --git a/BillingBundle/BillingBundle.php b/BillingBundle/BillingBundle.php
index 20f1bf7..923fc2f 100644
--- a/BillingBundle/BillingBundle.php
+++ b/BillingBundle/BillingBundle.php
@@ -9,6 +9,7 @@
 
 namespace Bluesquare\BillingBundle;
 
+use Bluesquare\BillingBundle\DependencyInjection\BillingExtension;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
@@ -18,4 +19,11 @@ class BillingBundle extends Bundle
     {
         parent::build($container);
     }
+
+    public function getContainerExtension()
+    {
+        if (null === $this->extension)
+            $this->extension = new BillingExtension();
+        return $this->extension;
+    }
 }