diff --git a/Form/Extension/ImageTypeExtension.php b/Form/Extension/ImageTypeExtension.php
index 4c820cd..dfa7425 100644
--- a/Form/Extension/ImageTypeExtension.php
+++ b/Form/Extension/ImageTypeExtension.php
@@ -41,7 +41,7 @@ public function __construct($imManager)
      */
     public function getExtendedType()
     {
-        return 'snowcap_core_image';
+        return 'Symfony\Component\Form\Extension\Core\Type\FormType';
     }
 
     /**
diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index efa6db0..29c5692 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -44,4 +44,4 @@ services:
         class: Snowcap\ImBundle\Form\Extension\ImageTypeExtension
         arguments: ['@snowcap_im.manager']
         tags:
-            -  { name: form.type_extension, alias: snowcap_core_image }
+            -  { name: form.type_extension, extended_type: Symfony\Component\Form\Extension\Core\Type\FormType }