diff --git a/book/forms.rst b/book/forms.rst
index dad3ff8d8bd..ca9da1812c6 100644
--- a/book/forms.rst
+++ b/book/forms.rst
@@ -1027,7 +1027,7 @@ the ``cascade_validation`` option::
     public function setDefaultOptions(OptionsResolverInterface $resolver)
     {
         $resolver->setDefaults(array(
-            'data_class' => 'Acme\TaskBundle\Entity\Category',
+            'data_class' => 'Acme\TaskBundle\Entity\Task',
             'cascade_validation' => true,
         ));
     }