],
                        'filters' => [
                                'css' => [
-                                       'class' => 'Rapsys\PackBundle\Twig\Filter\CPackFilter',
-                                       'args' => [
-                                               $finder->find('cpack', '/usr/local/bin/cpack'),
-                                               'minify'
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Twig\Filter\CPackFilter',
+                                               'args' => [
+                                                       $finder->find('cpack', '/usr/local/bin/cpack'),
+                                                       'minify'
+                                               ]
                                        ]
                                ],
                                'js' => [
-                                       'class' => 'Rapsys\PackBundle\Twig\Filter\JPackFilter',
-                                       'args' => [
-                                               $finder->find('jpack', '/usr/local/bin/jpack'),
-                                               'best'
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Twig\Filter\JPackFilter',
+                                               'args' => [
+                                                       $finder->find('jpack', '/usr/local/bin/jpack'),
+                                                       'best'
+                                               ]
                                        ]
                                ],
                                'img' => [
-                                       'class' => 'Rapsys\PackBundle\Twig\Filter\IPackFilter',
-                                       'args' => []
+                                       0 => [
+                                               'class' => 'Rapsys\PackBundle\Twig\Filter\IPackFilter',
+                                               'args' => []
+                                       ]
                                ],
                        ]
                ];
                                                                                ->scalarNode('class')
                                                                                        ->isRequired()
                                                                                        ->cannotBeEmpty()
-                                                                                       ->defaultValue($defaults['filters']['css']['class'])
+                                                                                       ->defaultValue($defaults['filters']['css'][0]['class'])
                                                                                ->end()
                                                                                ->arrayNode('args')
                                                                                        /*->isRequired()*/
                                                                                        ->treatNullLike(array())
-                                                                                       ->defaultValue($defaults['filters']['css']['args'])
+                                                                                       ->defaultValue($defaults['filters']['css'][0]['args'])
                                                                                        ->scalarPrototype()->end()
                                                                                ->end()
                                                                        ->end()
                                                                                ->scalarNode('class')
                                                                                        ->isRequired()
                                                                                        ->cannotBeEmpty()
-                                                                                       ->defaultValue($defaults['filters']['js']['class'])
+                                                                                       ->defaultValue($defaults['filters']['js'][0]['class'])
                                                                                ->end()
                                                                                ->arrayNode('args')
                                                                                        ->treatNullLike(array())
-                                                                                       ->defaultValue($defaults['filters']['js']['args'])
+                                                                                       ->defaultValue($defaults['filters']['js'][0]['args'])
                                                                                        ->scalarPrototype()->end()
                                                                                ->end()
                                                                        ->end()
                                                                                ->scalarNode('class')
                                                                                        ->isRequired()
                                                                                        ->cannotBeEmpty()
-                                                                                       ->defaultValue($defaults['filters']['img']['class'])
+                                                                                       ->defaultValue($defaults['filters']['img'][0]['class'])
                                                                                ->end()
                                                                                ->arrayNode('args')
                                                                                        ->treatNullLike(array())
-                                                                                       ->defaultValue($defaults['filters']['img']['args'])
+                                                                                       ->defaultValue($defaults['filters']['img'][0]['args'])
                                                                                        ->scalarPrototype()->end()
                                                                                ->end()
                                                                        ->end()