diff --git a/core/modules/image/src/Tests/ImageFieldDisplayTest.php b/core/modules/image/src/Tests/ImageFieldDisplayTest.php
index 875a2a2d90e7129ca6d1e987825a92500f5a8aeb..26478c4b78534f8396fa0610cda189a79bb5a492 100644
--- a/core/modules/image/src/Tests/ImageFieldDisplayTest.php
+++ b/core/modules/image/src/Tests/ImageFieldDisplayTest.php
@@ -342,6 +342,8 @@ function testImageFieldDefaultImage() {
 
     // Add a default image to the public image field.
     $images = $this->drupalGetTestFiles('image');
+    // $images[0] = image-test.png
+    // $images[2] = image-test.gif
     $alt = $this->randomString(512);
     $title = $this->randomString(1024);
     $edit = array(
@@ -377,7 +379,7 @@ function testImageFieldDefaultImage() {
     // Create alt text for the image.
     $alt = $this->randomMachineName();
 
-    $nid = $this->uploadNodeImage($images[1], $field_name, 'article', $alt);
+    $nid = $this->uploadNodeImage($images[2], $field_name, 'article', $alt);
     $node_storage->resetCache(array($nid));
     $node = $node_storage->load($nid);
     $file = $node->{$field_name}->entity;
@@ -412,7 +414,7 @@ function testImageFieldDefaultImage() {
     $this->createImageField($private_field_name, 'article', array('uri_scheme' => 'private'));
     // Add a default image to the new field.
     $edit = array(
-      'files[settings_default_image_uuid]' => drupal_realpath($images[1]->uri),
+      'files[settings_default_image_uuid]' => drupal_realpath($images[2]->uri),
       'settings[default_image][alt]' => $alt,
       'settings[default_image][title]' => $title,
     );