diff --git a/test/php/library/Icinga/Authentication/ManagerTest.php b/test/php/library/Icinga/Authentication/ManagerTest.php
index 4afd882f1..9db9d1c7b 100644
--- a/test/php/library/Icinga/Authentication/ManagerTest.php
+++ b/test/php/library/Icinga/Authentication/ManagerTest.php
@@ -41,6 +41,7 @@ require_once 'Zend/Log.php';
 require_once 'Zend/Config.php';
 require_once BaseTestCase::$libDir . '/Application/Logger.php';
 require_once BaseTestCase::$libDir . '/Authentication/Manager.php';
+require_once BaseTestCase::$libDir . '/Authentication/Membership.php';
 require_once BaseTestCase::$libDir . '/Authentication/Credential.php';
 require_once BaseTestCase::$libDir . '/Exception/ConfigurationError.php';
 require_once BaseTestCase::$libDir . '/Exception/ProgrammingError.php';