diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index c5a2c4b5afc7..567b8e988e94 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -24,6 +24,10 @@
  */
 class YamlFileLoader extends FileLoader
 {
+    private static $availableKeys = array(
+        'type', 'resource', 'prefix', 'pattern', 'options', 'defaults', 'requirements'
+    );
+
     /**
      * Loads a Yaml file.
      *
@@ -54,6 +58,8 @@ public function load($file, $type = null)
         }
 
         foreach ($config as $name => $config) {
+            $config = $this->normalizeRouteConfig($config);
+
             if (isset($config['resource'])) {
                 $type = isset($config['type']) ? $config['type'] : null;
                 $prefix = isset($config['prefix']) ? $config['prefix'] : null;
@@ -118,4 +124,27 @@ protected function loadFile($file)
     {
         return Yaml::load($file);
     }
+
+    /**
+     * Normalize route configuration.
+     *
+     * @param array  $config A resource config
+     *
+     * @return array
+     *
+     * @throws InvalidArgumentException if one of the provided config keys is not supported
+     */
+    private function normalizeRouteConfig(array $config)
+    {
+        foreach ($config as $key => $value) {
+            if (!in_array($key, self::$availableKeys)) {
+                throw new \InvalidArgumentException(sprintf(
+                    'Unsupported config key given: "%s". Expected one of the (%s).',
+                    $key, implode(', ', self::$availableKeys)
+                ));
+            }
+        }
+
+        return $config;
+    }
 }
diff --git a/tests/Symfony/Tests/Component/Routing/Fixtures/nonvalidkeys.yml b/tests/Symfony/Tests/Component/Routing/Fixtures/nonvalidkeys.yml
new file mode 100644
index 000000000000..015e270fb187
--- /dev/null
+++ b/tests/Symfony/Tests/Component/Routing/Fixtures/nonvalidkeys.yml
@@ -0,0 +1,3 @@
+someroute:
+  resource: path/to/some.yml
+  name_prefix: test_
diff --git a/tests/Symfony/Tests/Component/Routing/Loader/YamlFileLoaderTest.php b/tests/Symfony/Tests/Component/Routing/Loader/YamlFileLoaderTest.php
index cf820a597e9c..ca90e9ef1b6c 100644
--- a/tests/Symfony/Tests/Component/Routing/Loader/YamlFileLoaderTest.php
+++ b/tests/Symfony/Tests/Component/Routing/Loader/YamlFileLoaderTest.php
@@ -51,4 +51,13 @@ public function testLoadThrowsExceptionIfNotAnArray()
         $loader = new YamlFileLoader(new FileLocator(array(__DIR__.'/../Fixtures')));
         $loader->load('nonvalid.yml');
     }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     */
+    public function testLoadThrowsExceptionIfArrayHasUnsupportedKeys()
+    {
+        $loader = new YamlFileLoader(new FileLocator(array(__DIR__.'/../Fixtures')));
+        $loader->load('nonvalidkeys.yml');
+    }
 }