diff --git a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
index ec7880be89b95..67b9008423bb2 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php
@@ -148,45 +148,17 @@ private function populateAvailableType($id, Definition $definition)
             $this->types[$type] = $id;
         }
 
-        // Cannot use reflection if the class isn't set
-        if (!$definition->getClass()) {
+        if (!$reflectionClass = $this->getReflectionClass($id, $definition)) {
             return;
         }
 
-        if ($reflectionClass = $this->getReflectionClass($id, $definition)) {
-            $this->extractInterfaces($id, $reflectionClass);
-            $this->extractAncestors($id, $reflectionClass);
-        }
-    }
-
-    /**
-     * Extracts the list of all interfaces implemented by a class.
-     *
-     * @param string           $id
-     * @param \ReflectionClass $reflectionClass
-     */
-    private function extractInterfaces($id, \ReflectionClass $reflectionClass)
-    {
-        foreach ($reflectionClass->getInterfaces() as $interfaceName => $reflectionInterface) {
-            $this->set($interfaceName, $id);
-
-            $this->extractInterfaces($id, $reflectionInterface);
+        foreach ($reflectionClass->getInterfaces() as $reflectionInterface) {
+            $this->set($reflectionInterface->name, $id);
         }
-    }
-
-    /**
-     * Extracts all inherited types of a class.
-     *
-     * @param string           $id
-     * @param \ReflectionClass $reflectionClass
-     */
-    private function extractAncestors($id, \ReflectionClass $reflectionClass)
-    {
-        $this->set($reflectionClass->name, $id);
 
-        if ($reflectionParentClass = $reflectionClass->getParentClass()) {
-            $this->extractAncestors($id, $reflectionParentClass);
-        }
+        do {
+            $this->set($reflectionClass->name, $id);
+        } while ($reflectionClass = $reflectionClass->getParentClass());
     }
 
     /**
@@ -256,6 +228,7 @@ private function getReflectionClass($id, Definition $definition)
             return $this->reflectionClasses[$id];
         }
 
+        // Cannot use reflection if the class isn't set
         if (!$class = $definition->getClass()) {
             return;
         }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
index f1ed72e94a4cd..28d6ab6339eea 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
@@ -61,9 +61,10 @@ public function testProcessAutowireInterface()
         $pass = new AutowirePass();
         $pass->process($container);
 
-        $this->assertCount(2, $container->getDefinition('g')->getArguments());
+        $this->assertCount(3, $container->getDefinition('g')->getArguments());
         $this->assertEquals('f', (string) $container->getDefinition('g')->getArgument(0));
         $this->assertEquals('f', (string) $container->getDefinition('g')->getArgument(1));
+        $this->assertEquals('f', (string) $container->getDefinition('g')->getArgument(2));
     }
 
     public function testCompleteExistingDefinition()
@@ -317,13 +318,21 @@ interface EInterface extends DInterface
 {
 }
 
-class F implements EInterface
+interface IInterface
+{
+}
+
+class I implements IInterface
+{
+}
+
+class F extends I implements EInterface
 {
 }
 
 class G
 {
-    public function __construct(DInterface $d, EInterface $e)
+    public function __construct(DInterface $d, EInterface $e, IInterface $i)
     {
     }
 }