diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index bf3a414640..d96705d1ff 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -217,15 +217,14 @@ class Configuration implements ConfigurationInterface
                             ->fixXmlConfig('resource')
                             ->children()
                                 ->arrayNode('resources')
-                                    ->addDefaultsIfNotSet()
                                     ->defaultValue(array('FrameworkBundle:Form'))
+                                    ->prototype('scalar')->end()
                                     ->validate()
                                         ->ifTrue(function($v) {return !in_array('FrameworkBundle:Form', $v); })
                                         ->then(function($v){
                                             return array_merge(array('FrameworkBundle:Form'), $v);
                                         })
                                     ->end()
-                                    ->prototype('scalar')->end()
                                 ->end()
                             ->end()
                         ->end()
@@ -235,7 +234,6 @@ class Configuration implements ConfigurationInterface
                         ->arrayNode('assets_base_urls')
                             ->performNoDeepMerging()
                             ->addDefaultsIfNotSet()
-                            ->defaultValue(array('http' => array(), 'ssl' => array()))
                             ->beforeNormalization()
                                 ->ifTrue(function($v) { return !is_array($v); })
                                 ->then(function($v) { return array($v); })
@@ -290,7 +288,6 @@ class Configuration implements ConfigurationInterface
                                     ->arrayNode('base_urls')
                                         ->performNoDeepMerging()
                                         ->addDefaultsIfNotSet()
-                                        ->defaultValue(array('http' => array(), 'ssl' => array()))
                                         ->beforeNormalization()
                                             ->ifTrue(function($v) { return !is_array($v); })
                                             ->then(function($v) { return array($v); })
diff --git a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
index 74d52bdf98..4e5fe7ce6b 100644
--- a/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php
@@ -54,8 +54,8 @@ class Configuration implements ConfigurationInterface
                     ->fixXmlConfig('resource')
                     ->children()
                         ->arrayNode('resources')
-                            ->addDefaultsIfNotSet()
                             ->defaultValue(array('form_div_layout.html.twig'))
+                            ->prototype('scalar')->end()
                             ->setExample(array('MyBundle::form.html.twig'))
                             ->validate()
                                 ->ifTrue(function($v) { return !in_array('form_div_layout.html.twig', $v); })
@@ -63,7 +63,6 @@ class Configuration implements ConfigurationInterface
                                     return array_merge(array('form_div_layout.html.twig'), $v);
                                 })
                             ->end()
-                            ->prototype('scalar')->end()
                         ->end()
                     ->end()
                 ->end()