diff --git a/DependencyInjection/Factory/AdapterFactoryInterface.php b/DependencyInjection/Factory/AdapterFactoryInterface.php
index a49d83a..0fc8ad4 100644
--- a/DependencyInjection/Factory/AdapterFactoryInterface.php
+++ b/DependencyInjection/Factory/AdapterFactoryInterface.php
@@ -15,11 +15,9 @@ interface AdapterFactoryInterface
     /**
      * Creates the adapter, registers it and returns its id
      *
-     * @param  ContainerBuilder $container
-     * @param  string           $id
-     * @param  array            $config
-     *
-     * @return string The Adapter service id in the DIC
+     * @param  ContainerBuilder $container  A ContainerBuilder instance
+     * @param  string           $id         The id of the service
+     * @param  array            $config     An array of configuration
      */
     function create(ContainerBuilder $container, $id, array $config);
 
diff --git a/DependencyInjection/Factory/InMemoryAdapterFactory.php b/DependencyInjection/Factory/InMemoryAdapterFactory.php
index 4bf578b..78d1be4 100644
--- a/DependencyInjection/Factory/InMemoryAdapterFactory.php
+++ b/DependencyInjection/Factory/InMemoryAdapterFactory.php
@@ -18,14 +18,10 @@ class InMemoryAdapterFactory implements AdapterFactoryInterface
      */
     public function create(ContainerBuilder $container, $id, array $config)
     {
-        $adapter = sprintf('knplabs_gaufrette.adapter.local.%s', $id);
-
         $container
-            ->setDefinition($adapter, new DefinitionDecorator('knplabs_gaufrette.adapter.in_memory'))
+            ->setDefinition($id, new DefinitionDecorator('knplabs_gaufrette.adapter.in_memory'))
             ->replaceArgument(0, $config['files'])
         ;
-
-        return $adapter;
     }
 
     /**
diff --git a/DependencyInjection/Factory/LocalAdapterFactory.php b/DependencyInjection/Factory/LocalAdapterFactory.php
index 5d1fb15..75bb526 100644
--- a/DependencyInjection/Factory/LocalAdapterFactory.php
+++ b/DependencyInjection/Factory/LocalAdapterFactory.php
@@ -18,15 +18,11 @@ class LocalAdapterFactory implements AdapterFactoryInterface
      */
     public function create(ContainerBuilder $container, $id, array $config)
     {
-        $adapter = sprintf('knplabs_gaufrette.adapter.local.%s', $id);
-
         $container
-            ->setDefinition($adapter, new DefinitionDecorator('knplabs_gaufrette.adapter.local'))
+            ->setDefinition($id, new DefinitionDecorator('knplabs_gaufrette.adapter.local'))
             ->replaceArgument(0, $config['directory'])
             ->replaceArgument(1, $config['create'])
         ;
-
-        return $adapter;
     }
 
     /**
diff --git a/DependencyInjection/Factory/SafeLocalAdapterFactory.php b/DependencyInjection/Factory/SafeLocalAdapterFactory.php
index 49540d5..aa670e4 100644
--- a/DependencyInjection/Factory/SafeLocalAdapterFactory.php
+++ b/DependencyInjection/Factory/SafeLocalAdapterFactory.php
@@ -18,15 +18,11 @@ class SafeLocalAdapterFactory implements AdapterFactoryInterface
      */
     public function create(ContainerBuilder $container, $id, array $config)
     {
-        $adapter = sprintf('knplabs_gaufrette.adapter.safe_local.%s', $id);
-
         $container
-            ->setDefinition($adapter, new DefinitionDecorator('knplabs_gaufrette.adapter.safe_local'))
+            ->setDefinition($id, new DefinitionDecorator('knplabs_gaufrette.adapter.safe_local'))
             ->replaceArgument(0, $config['directory'])
             ->replaceArgument(1, $config['create'])
         ;
-
-        return $adapter;
     }
 
     /**
diff --git a/DependencyInjection/Factory/ServiceAdapterFactory.php b/DependencyInjection/Factory/ServiceAdapterFactory.php
index aefe533..5578caa 100644
--- a/DependencyInjection/Factory/ServiceAdapterFactory.php
+++ b/DependencyInjection/Factory/ServiceAdapterFactory.php
@@ -17,7 +17,7 @@ class ServiceAdapterFactory implements AdapterFactoryInterface
      */
     public function create(ContainerBuilder $container, $id, array $config)
     {
-        return $config['id'];
+        $container->setAlias($id, $config['id']);
     }
 
     /**
diff --git a/DependencyInjection/KnplabsGaufretteExtension.php b/DependencyInjection/KnplabsGaufretteExtension.php
index 2710bbd..0949791 100644
--- a/DependencyInjection/KnplabsGaufretteExtension.php
+++ b/DependencyInjection/KnplabsGaufretteExtension.php
@@ -55,7 +55,10 @@ class KnplabsGaufretteExtension extends Extension
         $adapter = null;
         foreach ($config as $key => $adapter) {
             if (array_key_exists($key, $factories)) {
-                return $factories[$key]->create($container, $name, $adapter);
+                $id = sprintf('gaufrette.%s_adapter', $name);
+                $factories[$key]->create($container, $id, $adapter);
+
+                return $id;
             }
         }