diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
index b57fb66bff..1a198bca5d 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
@@ -332,7 +332,7 @@ class EnvConfigurationWithoutRootNode implements ConfigurationInterface
 {
     public function getConfigTreeBuilder()
     {
-        return new TreeBuilder();
+        return new TreeBuilder('env_extension');
     }
 }
 
@@ -340,8 +340,8 @@ class ConfigurationWithArrayNodeRequiringOneElement implements ConfigurationInte
 {
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $treeBuilder->root('env_extension')
+        $treeBuilder = new TreeBuilder('env_extension');
+        $treeBuilder->getRootNode()
             ->children()
                 ->arrayNode('nodes')
                     ->isRequired()