diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 920f8bc7..7457ae90 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -5,6 +5,8 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
+define('PHPUNIT_RUN', 1);
+
 require_once __DIR__.'/../../../lib/base.php';
 require_once __DIR__.'/../vendor/autoload.php';