diff --git a/src/Symfony/Component/DependencyInjection/Container.php b/src/Symfony/Component/DependencyInjection/Container.php
index ef561e1ded..b97f8a2c03 100644
--- a/src/Symfony/Component/DependencyInjection/Container.php
+++ b/src/Symfony/Component/DependencyInjection/Container.php
@@ -88,6 +88,7 @@ class Container implements IntrospectableContainerInterface
         $this->parameterBag = null === $parameterBag ? new ParameterBag() : $parameterBag;
 
         $this->services       = array();
+        $this->aliases        = array();
         $this->scopes         = array();
         $this->scopeChildren  = array();
         $this->scopedServices = array();
@@ -228,7 +229,10 @@ class Container implements IntrospectableContainerInterface
     {
         $id = strtolower($id);
 
-        return array_key_exists($id, $this->services) || method_exists($this, 'get'.strtr($id, array('_' => '', '.' => '_')).'Service');
+        return array_key_exists($id, $this->services)
+            || array_key_exists($id, $this->aliases)
+            || method_exists($this, 'get'.strtr($id, array('_' => '', '.' => '_')).'Service')
+        ;
     }
 
     /**
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
index f49a567f52..c87f2c2b9a 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
@@ -477,6 +477,14 @@ class ContainerTest extends \PHPUnit_Framework_TestCase
 
         return $reflection->getValue($obj);
     }
+
+    public function testAlias()
+    {
+        $c = new ProjectServiceContainer();
+
+        $this->assertTrue($c->has('alias'));
+        $this->assertSame($c->get('alias'), $c->get('bar'));
+    }
 }
 
 class ProjectServiceContainer extends Container
@@ -490,6 +498,7 @@ class ProjectServiceContainer extends Container
         $this->__bar = new \stdClass();
         $this->__foo_bar = new \stdClass();
         $this->__foo_baz = new \stdClass();
+        $this->aliases = array('alias' => 'bar');
     }
 
     protected function getScopedService()