diff --git a/core/modules/image/tests/src/Functional/QuickEditImageControllerTest.php b/core/modules/image/tests/src/Functional/QuickEditImageControllerTest.php
index c598b0e293..309ee04be6 100644
--- a/core/modules/image/tests/src/Functional/QuickEditImageControllerTest.php
+++ b/core/modules/image/tests/src/Functional/QuickEditImageControllerTest.php
@@ -199,6 +199,7 @@ public function uploadImage($image, $nid, $field_name, $langcode) {
       ],
       'http_errors' => FALSE,
       'cookies'     => $this->cookies,
+      'headers' => ['Accept' => 'application/json'],
     ]);
   }