diff --git a/library/Director/Test/BaseTestCase.php b/library/Director/Test/BaseTestCase.php
index cd250759..3b32193d 100644
--- a/library/Director/Test/BaseTestCase.php
+++ b/library/Director/Test/BaseTestCase.php
@@ -12,7 +12,7 @@ use Icinga\Module\Director\Db\Migrations;
 use Icinga\Module\Director\Objects\IcingaObject;
 use PHPUnit_Framework_TestCase;
 
-class BaseTestCase extends PHPUnit_Framework_TestCase
+abstract class BaseTestCase extends PHPUnit_Framework_TestCase
 {
     private static $app;
 
diff --git a/library/Director/Test/IcingaObjectTestCase.php b/library/Director/Test/IcingaObjectTestCase.php
index 3e307c55..a37fcedd 100644
--- a/library/Director/Test/IcingaObjectTestCase.php
+++ b/library/Director/Test/IcingaObjectTestCase.php
@@ -7,7 +7,7 @@ use Icinga\Module\Director\Objects\IcingaObject;
 /**
  * Icinga Object test helper class
  */
-class IcingaObjectTestCase extends BaseTestCase
+abstract class IcingaObjectTestCase extends BaseTestCase
 {
     protected $table;
     protected $testObjectName = '___TEST___';