diff --git a/DependencyInjection/AntaresAccessibleExtension.php b/DependencyInjection/AntaresAccessibleExtension.php
index 7fc88ac..1e944b2 100644
--- a/DependencyInjection/AntaresAccessibleExtension.php
+++ b/DependencyInjection/AntaresAccessibleExtension.php
@@ -19,7 +19,7 @@ class AntaresAccessibleExtension extends Extension
      */
     public function load(array $configs, ContainerBuilder $container)
     {
-        $configuration = new Configuration();
+        $configuration = new Configuration($container->getParameter('kernel.debug'));
         $config = $this->processConfiguration($configuration, $configs);
 
         $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 76ef799..1984690 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -12,6 +12,13 @@
  */
 class Configuration implements ConfigurationInterface
 {
+    private $debug;
+
+    public function __construct($debug)
+    {
+        $this->debug = (bool) $debug;
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -31,7 +38,7 @@ public function getConfigTreeBuilder()
                 ->arrayNode('constraints_validation')
                     ->addDefaultsIfNotSet()
                     ->children()
-                        ->booleanNode('validate_initialize_values')->defaultValue('%kernel.debug%')->end()
+                        ->booleanNode('validate_initialize_values')->defaultValue($this->debug)->end()
                     ->end()
                 ->end()
             ->end()