diff --git a/core/modules/simpletest/files/image-test.webp b/core/modules/simpletest/files/img-test.webp
similarity index 100%
rename from core/modules/simpletest/files/image-test.webp
rename to core/modules/simpletest/files/img-test.webp
diff --git a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
index 1e5b7f9..dbb97f7 100644
--- a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
@@ -145,7 +145,7 @@ function testManipulations() {
       'image-test.jpg',
     );
     if (version_compare(PHP_VERSION, '7.1.0') >= 0) {
-      $files[] = 'image-test.webp';
+      $files[] = 'img-test.webp';
     }
 
     // Setup a list of tests to perform on each type.