diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/UserProvider/LdapFactory.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/UserProvider/LdapFactory.php
index cbd5f038964c..5007b740363f 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/UserProvider/LdapFactory.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/UserProvider/LdapFactory.php
@@ -48,6 +48,7 @@ public function getKey()
     public function addConfiguration(NodeDefinition $node)
     {
         $node
+            ->fixXmlConfig('extra_field')
             ->fixXmlConfig('default_role')
             ->children()
                 ->scalarNode('service')->isRequired()->cannotBeEmpty()->defaultValue('ldap')->end()