diff --git a/core/modules/image/src/Tests/ImageAdminStylesTest.php b/core/modules/image/src/Tests/ImageAdminStylesTest.php
index 35786c1..ed7b8e5 100644
--- a/core/modules/image/src/Tests/ImageAdminStylesTest.php
+++ b/core/modules/image/src/Tests/ImageAdminStylesTest.php
@@ -307,8 +307,10 @@ function testAjaxEnabledEffectForm() {
 
     // Edit back the effects.
     foreach ($style->getEffects() as $uuid => $effect) {
-      $effect_path = $style_path = $admin_path . '/manage/' . $style_name . '/effects/' . $uuid;
-      $this->drupalPostForm($effect_path, $effect_edit, t('Update effect'));
+      $effect_path = $admin_path . '/manage/' . $style_name . '/effects/' . $uuid;
+      $this->drupalGet($effect_path);
+      $this->drupalPostAjaxForm(NULL, $effect_edit, ['op' => t('Ajax refresh')]);
+      $this->drupalPostForm(NULL, $effect_edit, t('Update effect'));
     }
 
   }
diff --git a/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/AjaxTestImageEffect.php b/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/AjaxTestImageEffect.php
index 8e1e393..b4fa17e 100644
--- a/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/AjaxTestImageEffect.php
+++ b/core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/AjaxTestImageEffect.php
@@ -69,7 +69,7 @@ public function ajaxCallback($form, FormStateInterface $form_state) {
       '#markup' => microtime(),
     );
     $response = new AjaxResponse();
-    $response->addCommand(new HtmlCommand('#ajax-value', drupal_render($item)));
+    $response->addCommand(new HtmlCommand('#ajax-value', $item));
     return $response;
   }