diff --git a/core/modules/image/image.routing.yml b/core/modules/image/image.routing.yml
index 8267a5b..ae5e88f 100644
--- a/core/modules/image/image.routing.yml
+++ b/core/modules/image/image.routing.yml
@@ -21,7 +21,7 @@ image.style_delete:
     _permission: 'administer image styles'
 
 image.style_flush:
-  path: 'admin/config/media/image-styles/manage/{image_style}/flush'
+  path: '/admin/config/media/image-styles/manage/{image_style}/flush'
   defaults:
     _entity_form: 'image_style.flush'
     _title: 'Flush'