diff --git a/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php b/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
index 752dbaf..ea88fd3 100644
--- a/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
+++ b/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
@@ -12,6 +12,7 @@
 use Drupal\Core\Controller\ControllerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Lock\LockBackendInterface;
+use Drupal\image\ImageStyleInterface;
 use Drupal\system\FileController;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
@@ -81,15 +82,16 @@ public static function create(ContainerInterface $container) {
    *   The request object.
    * @param string $scheme
    *   The file scheme, defaults to 'private'.
-   * @param string $image_style
+   * @param \Drupal\image\ImageStyleInterface $image_style
    *   The image style to deliver.
    *
    * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
+   *   Thrown when the user does not have access to the file.
    *
    * @return \Symfony\Component\HttpFoundation\BinaryFileResponse|\Symfony\Component\HttpFoundation\Response
    *   The transferred file as response or some error response.
    */
-  public function deliver(Request $request, $scheme, $image_style) {
+  public function deliver(Request $request, $scheme, ImageStyleInterface $image_style) {
     $target = $request->query->get('file');
 
     // Check that the style is defined, the scheme is valid, and the image