diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
index c79868c523c7..439ce6104647 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
@@ -321,7 +321,6 @@ private function addProvidersSection(ArrayNodeDefinition $rootNode)
                         ),
                         'my_entity_provider' => array('entity' => array('class' => 'SecurityBundle:User', 'property' => 'username')),
                     ))
-                    ->disallowNewKeysInSubsequentConfigs()
                     ->isRequired()
                     ->requiresAtLeastOneElement()
                     ->useAttributeAsKey('name')