diff --git a/config/routes.php b/config/routes.php
index cecf3d8..7a5e805 100644
--- a/config/routes.php
+++ b/config/routes.php
@@ -1,10 +1,12 @@
 <?php
 
+declare(strict_types=1);
+
 use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
 use Terminal42\NotificationCenterBundle\BulkyItem\BulkyItemStorage;
 use Terminal42\NotificationCenterBundle\Controller\DownloadBulkyItemController;
 
-return function (RoutingConfigurator $routes): void {
+return static function (RoutingConfigurator $routes): void {
     $routes->add('nc_bulky_item_download', '/notifications/download/{voucher}')
         ->controller(DownloadBulkyItemController::class)
         ->requirements(['voucher' => BulkyItemStorage::VOUCHER_REGEX])
diff --git a/src/ContaoManager/Plugin.php b/src/ContaoManager/Plugin.php
index 14820a9..b05fc5e 100644
--- a/src/ContaoManager/Plugin.php
+++ b/src/ContaoManager/Plugin.php
@@ -11,7 +11,6 @@
 use Contao\ManagerPlugin\Routing\RoutingPluginInterface;
 use Symfony\Component\Config\Loader\LoaderResolverInterface;
 use Symfony\Component\HttpKernel\KernelInterface;
-use Terminal42\NotificationCenterBundle\Controller\DownloadBulkyItemController;
 use Terminal42\NotificationCenterBundle\Terminal42NotificationCenterBundle;
 
 class Plugin implements BundlePluginInterface, RoutingPluginInterface