diff --git a/Form/DataTransformer/BaseFileToStringTransformer.php b/Form/DataTransformer/BaseFileToStringTransformer.php
index be6883e..1def110 100644
--- a/Form/DataTransformer/BaseFileToStringTransformer.php
+++ b/Form/DataTransformer/BaseFileToStringTransformer.php
@@ -13,6 +13,7 @@
 
 use Symfony\Component\Form\DataTransformerInterface;
 use Vlabs\MediaBundle\Entity\BaseFileInterface;
+use Symfony\Component\HttpFoundation\File\File;
 
 /**
  * Return the path in the form view data.
@@ -27,7 +28,7 @@ class BaseFileToStringTransformer implements DataTransformerInterface
      */
     public function transform($data)
     {
-        return ($data instanceof BaseFileInterface) ? (string) $data->getPath() : null;
+        return ($data instanceof BaseFileInterface) ? new File($data->getPath(), false) : null;
     }
 
     /**
diff --git a/Form/Type/DelFileType.php b/Form/Type/DelFileType.php
index a46af32..09d1314 100644
--- a/Form/Type/DelFileType.php
+++ b/Form/Type/DelFileType.php
@@ -13,6 +13,7 @@
 
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\OptionsResolver\OptionsResolverInterface;
+use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
 
 /**
  * @author Valentin Ferriere <valentin.ferriere@gmail.com>
@@ -43,14 +44,22 @@ public function setDefaultOptions(OptionsResolverInterface $resolver)
      */
     public function getParent()
     {
-        return 'checkbox';
+        return CheckboxType::class;
     }
 
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getBlockPrefix()
     {
         return 'vlabs_del_file';
     }
+
+    /**
+     * Backwards compatability for Symfony < 2.7
+     */
+    public function getName()
+    {
+        return $this->getBlockPrefix();
+    }
 }
diff --git a/Form/Type/FileType.php b/Form/Type/FileType.php
index 636f79d..ed327a3 100644
--- a/Form/Type/FileType.php
+++ b/Form/Type/FileType.php
@@ -19,6 +19,7 @@
 use Vlabs\MediaBundle\Form\DataTransformer\BaseFileToStringTransformer;
 use Vlabs\MediaBundle\EventListener\BaseFileListener;
 use Vlabs\MediaBundle\Handler\HandlerManager;
+use Symfony\Component\Form\Extension\Core\Type\FileType as BaseFileType;
 
 /**
  * @author Valentin Ferriere <valentin.ferriere@gmail.com>
@@ -71,14 +72,22 @@ public function setDefaultOptions(OptionsResolverInterface $resolver)
      */
     public function getParent()
     {
-        return 'file';
+        return BaseFileType::class;
     }
 
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getBlockPrefix()
     {
         return 'vlabs_file';
     }
+
+    /**
+     * Backwards compatability for Symfony < 2.7
+     */
+    public function getName()
+    {
+        return $this->getBlockPrefix();
+    }    
 }
diff --git a/composer.json b/composer.json
index b0ba934..be2f466 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "symfony/validator": ">=2.1 | >=2.3",
         "imagine/Imagine": "<=0.5",
         "doctrine/orm": "*",
-        "knplabs/knp-gaufrette-bundle": "v0.1.7",
+        "knplabs/knp-gaufrette-bundle": "^0.3.0",
         "symfony/finder": ">=2.1"
     },