diff --git a/src/Trinity/Bundle/NotificationBundle/DependencyInjection/Configuration.php b/src/Trinity/Bundle/NotificationBundle/DependencyInjection/Configuration.php
index 3e4224c..7e261b9 100644
--- a/src/Trinity/Bundle/NotificationBundle/DependencyInjection/Configuration.php
+++ b/src/Trinity/Bundle/NotificationBundle/DependencyInjection/Configuration.php
@@ -18,7 +18,7 @@ class Configuration implements ConfigurationInterface
     public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('trinity_notification')
+        $treeBuilder->root('trinity_notification')
             ->children()
             ->booleanNode('use_ace_editor')
                 ->defaultFalse()