diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index b1849afde8360..3335149d7f574 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -648,6 +648,7 @@ private function addAssetsSection(ArrayNodeDefinition $rootNode)
                     ->fixXmlConfig('package')
                     ->children()
                         ->arrayNode('packages')
+                            ->normalizeKeys(false)
                             ->useAttributeAsKey('name')
                             ->prototype('array')
                                 ->fixXmlConfig('base_url')