diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
index f340bc3c79..160dc671c7 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
@@ -122,6 +122,7 @@ class Configuration implements ConfigurationInterface
                 ->scalarNode('debug')->defaultValue('%kernel.debug%')->end()
                 ->scalarNode('strict_variables')->end()
                 ->scalarNode('auto_reload')->end()
+                ->scalarNode('optimizations')->end()
             ->end()
         ;
     }