diff --git a/Tests/Fixtures/Form/TestType.php b/Tests/Fixtures/Form/TestType.php
index 004e4e9..03fd4fe 100644
--- a/Tests/Fixtures/Form/TestType.php
+++ b/Tests/Fixtures/Form/TestType.php
@@ -12,14 +12,14 @@
 namespace Nelmio\ApiDocBundle\Tests\Fixtures\Form;
 
 use Symfony\Component\Form\AbstractType;
-use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\FormBuilderInterface;
 
 class TestType extends AbstractType
 {
     /**
      * {@inheritdoc}
      */
-    public function buildForm(FormBuilder $builder, array $options)
+    public function buildForm(FormBuilderInterface $builder, array $options)
     {
         $builder->add('a', null, array('description' => 'A nice description'));
         $builder->add('b');