diff --git a/cookbook/form/dynamic_form_modification.rst b/cookbook/form/dynamic_form_modification.rst
index a798c187db5..0b15b860dc5 100644
--- a/cookbook/form/dynamic_form_modification.rst
+++ b/cookbook/form/dynamic_form_modification.rst
@@ -475,6 +475,8 @@ The subscriber would now look like::
     use Symfony\Component\Form\FormFactoryInterface;
     use Doctrine\ORM\EntityManager;
     use Symfony\Component\Form\FormEvent;
+    use Symfony\Component\Form\FormEvents;
+    use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
     class RegistrationSportListener implements EventSubscriberInterface
     {