diff --git a/core/modules/ckeditor5/ckeditor5.ckeditor5.yml b/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
index 6e30cce9073..929992e498e 100644
--- a/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
+++ b/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
@@ -558,7 +558,7 @@ ckeditor5_imageResize:
       - image.ImageResize
     config:
       image:
-        resizeUnit: '%'
+        resizeUnit: 'px'
         resizeOptions:
           -
             name: 'resizeImage:original'