diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index d2fd657..07fea7a 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -17,8 +17,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('tetranz_select2_entity');
+        $treeBuilder = new TreeBuilder('tetranz_select2_entity');
+        $rootNode = \method_exists($treeBuilder, 'getRootNode') ? $treeBuilder->getRootNode() : $treeBuilder->root('tetranz_select2_entity');
 
         $rootNode
                 ->children()