diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
index 54ad8be7c8c9..e903a4263474 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -237,8 +237,15 @@ private function parseDefinition($id, $service, $file)
             }
 
             foreach ($service['calls'] as $call) {
-                $args = isset($call[1]) ? $this->resolveServices($call[1]) : array();
-                $definition->addMethodCall($call[0], $args);
+                if (isset($call['method'])) {
+                    $method = $call['method'];
+                    $args = isset($call['arguments']) ? $this->resolveServices($call['arguments']) : array();
+                } else {
+                    $method = $call[0];
+                    $args = isset($call[1]) ? $this->resolveServices($call[1]) : array();
+                }
+
+                $definition->addMethodCall($method, $args);
             }
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services21.yml b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services21.yml
new file mode 100644
index 000000000000..da717a8bb296
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services21.yml
@@ -0,0 +1,15 @@
+services:
+    manager:
+        class: UserManager
+        arguments:
+          - true
+        calls:
+          - method: setLogger
+            arguments:
+              - @logger
+          - method: setClass
+            arguments:
+              - User
+        tags:
+          - name: manager
+            alias: user
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
index 4d40e7c9c3c2..6bcb19c74678 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php
@@ -270,4 +270,16 @@ public function testTagWithAttributeArrayThrowsException()
             $this->assertStringStartsWith('A "tags" attribute must be of a scalar-type for service "foo_service", tag "foo", attribute "bar"', $e->getMessage(), '->load() throws an InvalidArgumentException if a tag-attribute is not a scalar');
         }
     }
+
+    public function testLoadYamlOnlyWithKeys()
+    {
+        $container = new ContainerBuilder();
+        $loader = new YamlFileLoader($container, new FileLocator(self::$fixturesPath.'/yaml'));
+        $loader->load('services21.yml');
+
+        $definition = $container->getDefinition('manager');
+        $this->assertEquals(array(array('setLogger', array(new Reference('logger'))), array('setClass', array('User'))), $definition->getMethodCalls());
+        $this->assertEquals(array(true), $definition->getArguments());
+        $this->assertEquals(array('manager' => array(array('alias' => 'user'))), $definition->getTags());
+    }
 }