diff --git a/tests/src/Functional/MaskUserDataTest.php b/tests/src/Functional/MaskUserDataTest.php
index e628f06..523a00d 100644
--- a/tests/src/Functional/MaskUserDataTest.php
+++ b/tests/src/Functional/MaskUserDataTest.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\Tests\mask_user_data\Functional;
 
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 use Drupal\Tests\BrowserTestBase;
 use Drupal\user\Entity\User as DUser;
 
@@ -10,6 +12,8 @@ use Drupal\user\Entity\User as DUser;
  *
  * @group mask_user_data
  */
+#[Group('mask_user_data')]
+#[RunTestsInSeparateProcesses]
 class MaskUserDataTest extends BrowserTestBase {
 
   /**