diff --git a/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php b/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
index ef0a19c6a7..c7a4ac89c1 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php
@@ -42,10 +42,12 @@ class DecoratorServicePass implements CompilerPassInterface
                 $public = $alias->isPublic();
                 $container->setAlias($renamedId, new Alias((string) $alias, false));
             } else {
-                $definition = $container->getDefinition($inner);
-                $public = $definition->isPublic();
-                $definition->setPublic(false);
-                $container->setDefinition($renamedId, $definition);
+                $decoratedDefinition = $container->getDefinition($inner);
+                $definition->setTags($decoratedDefinition->getTags(), $definition->getTags());
+                $public = $decoratedDefinition->isPublic();
+                $decoratedDefinition->setPublic(false);
+                $decoratedDefinition->setTags(array());
+                $container->setDefinition($renamedId, $decoratedDefinition);
             }
 
             $container->setAlias($inner, new Alias($id, $public));
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
index 7ddf44dfc0..b197e42249 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php
@@ -82,6 +82,24 @@ class DecoratorServicePassTest extends \PHPUnit_Framework_TestCase
         $this->assertNull($fooExtendedDefinition->getDecoratedService());
     }
 
+    public function testProcessMovesTagsFromDecoratedDefinitionToDecoratingDefinition()
+    {
+        $container = new ContainerBuilder();
+        $container
+            ->register('foo')
+            ->setTags(array('name' => 'bar'))
+        ;
+        $container
+            ->register('baz')
+            ->setDecoratedService('foo')
+        ;
+
+        $this->process($container);
+
+        $this->assertEmpty($container->getDefinition('baz.inner')->getTags());
+        $this->assertEquals(array('name' => 'bar'), $container->getDefinition('baz')->getTags());
+    }
+
     protected function process(ContainerBuilder $container)
     {
         $repeatedPass = new DecoratorServicePass();