diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 24e485d..c03f2ec 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -27,8 +27,8 @@ public function getConfigTreeBuilder()
     {
         $supportedDrivers = array('orm', 'mongodb');
 
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('pix_sortable_behavior');
+        $treeBuilder = new TreeBuilder('pix_sortable_behavior');
+        $rootNode = $treeBuilder->getRootNode();
 
         $rootNode
             ->children()