diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index e66061440b..ee35abd921 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -1516,7 +1516,9 @@ class Configuration implements ConfigurationInterface
                             ->prototype('scalar')->end()
                         ->end()
                     ->end()
-                    ->booleanNode('notification_on_failed_messages')->defaultFalse()->end()
+                    ->children()
+                        ->booleanNode('notification_on_failed_messages')->defaultFalse()->end()
+                    ->end()
                     ->children()
                         ->arrayNode('channel_policy')
                             ->useAttributeAsKey('name')