diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index a01d1cb..d629ea6 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -101,6 +101,7 @@ class Configuration implements ConfigurationInterface
                         ->children()
                             ->arrayNode('servers')
                                 ->prototype('array')
+                                    ->fixXmlConfig('header')
                                     ->children()
                                         ->scalarNode('url')
                                             ->validate()
@@ -116,9 +117,8 @@ class Configuration implements ConfigurationInterface
                                             ->treatTrueLike('fos_elastica.logger')
                                         ->end()
                                         ->arrayNode('headers')
-                                            ->children()
-                                                ->scalarNode('Authorization')->end()
-                                            ->end()
+                                            ->useAttributeAsKey('name')
+                                            ->prototype('scalar')->end()
                                         ->end()
                                         ->scalarNode('timeout')->end()
                                     ->end()