diff --git a/core/modules/ckeditor5/tests/src/FunctionalJavascript/ImageTestBase.php b/core/modules/ckeditor5/tests/src/FunctionalJavascript/ImageTestBase.php
index 8690f0057859f4056a5add794814c53cef991491..440fc3b2a72be7481a6150cadbb6a7e8306fa90b 100644
--- a/core/modules/ckeditor5/tests/src/FunctionalJavascript/ImageTestBase.php
+++ b/core/modules/ckeditor5/tests/src/FunctionalJavascript/ImageTestBase.php
@@ -55,7 +55,7 @@ abstract class ImageTestBase extends CKEditor5TestBase {
    * @return string[]
    */
   protected function imageAttributes() {
-    return ['src' => '/core/misc/druplicon.png'];
+    return ['src' => base_path() . 'core/misc/druplicon.png'];
   }
 
   /**