diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantEnum.php b/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantEnum.php
new file mode 100644
index 0000000000000..db84fe6cee15f
--- /dev/null
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantEnum.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Tests\Fixtures\Psr4Controllers\SubNamespace;
+
+/**
+ * An irrelevant enum.
+ *
+ * This fixture is not referenced anywhere. Its presence makes sure, enums are silently ignored when loading routes
+ * from a directory.
+ */
+enum IrrelevantEnum
+{
+    case Foo;
+    case Bar;
+}
diff --git a/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantInterface.php b/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantInterface.php
index eb7dac654eebf..8e96349eb4f11 100644
--- a/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantInterface.php
+++ b/src/Symfony/Component/Routing/Tests/Fixtures/Psr4Controllers/SubNamespace/IrrelevantInterface.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Symfony\Component\Routing\Tests\Fixtures\Psr4Controllers\SubNamespace;
 
 interface IrrelevantInterface