diff --git a/docs/src/in-depth-guide/zend-form-zend-form-fieldset.rst b/docs/src/in-depth-guide/zend-form-zend-form-fieldset.rst
index 63cfc207c..b88f5319d 100644
--- a/docs/src/in-depth-guide/zend-form-zend-form-fieldset.rst
+++ b/docs/src/in-depth-guide/zend-form-zend-form-fieldset.rst
@@ -636,6 +636,7 @@ As you can see the ``savePost()`` function has been added and needs to be implem
     namespace Blog\Service;
 
     use Blog\Mapper\PostMapperInterface;
+    use Blog\Model\PostInterface;
     
 
     class PostService implements PostServiceInterface