diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 76a18f3..338e31d 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -15,8 +15,13 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('limenius_react');
+        $treeBuilder = new TreeBuilder('limenius_react');
+        if (method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $rootNode = $treeBuilder->root('limenius_react');
+        }
         $rootNode
             ->children()
                 ->enumNode('default_rendering')