diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 655e95cf93061..572624428c6e8 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -99,7 +99,7 @@ public function getConfigTreeBuilder()
 
                         foreach ($v['templating']['packages'] as $name => $config) {
                             $v['assets']['packages'][$name] = array(
-                                'version' => (string) $config['version'],
+                                'version' => $config['version'],
                                 'version_format' => $config['version_format'],
                                 'base_path' => '',
                                 'base_urls' => array_values(array_unique(array_merge($config['base_urls']['http'], $config['base_urls']['ssl']))),
diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 7e69c28fd825f..b70def8df11e6 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -584,12 +584,8 @@ private function registerAssetsConfiguration(array $config, ContainerBuilder $co
 
         $namedPackages = array();
         foreach ($config['packages'] as $name => $package) {
-            if (null === $package['version']) {
-                $version = $defaultVersion;
-            } else {
-                $format = $package['version_format'] ?: $config['version_format'];
-                $version = $this->createVersion($container, $package['version'], $format, $name);
-            }
+            $format = $package['version_format'] ?: $config['version_format'];
+            $version = $this->createVersion($container, $package['version'], $format, $name);
 
             $container->setDefinition('assets._package_'.$name, $this->createPackageDefinition($package['base_path'], $package['base_urls'], $version));
             $namedPackages[$name] = new Reference('assets._package_'.$name);