diff --git a/core/modules/update/tests/src/Functional/UpdateUploaderTestBase.php b/core/modules/update/tests/src/Functional/UpdateUploaderTestBase.php
index 972495444d9..f0a955a42b6 100644
--- a/core/modules/update/tests/src/Functional/UpdateUploaderTestBase.php
+++ b/core/modules/update/tests/src/Functional/UpdateUploaderTestBase.php
@@ -7,7 +7,7 @@ use Drupal\Core\DrupalKernel;
 /**
  * Base test class for tests that test project upload functionality.
  */
-class UpdateUploaderTestBase extends UpdateTestBase {
+abstract class UpdateUploaderTestBase extends UpdateTestBase {
 
   /**
    * {@inheritdoc}