diff --git a/tests/Utils/TaskSchedule/TaskAbstractTest.php b/tests/Utils/TaskSchedule/TaskAbstractTest.php
index 47ecc83ff..6c1d35c01 100644
--- a/tests/Utils/TaskSchedule/TaskAbstractTest.php
+++ b/tests/Utils/TaskSchedule/TaskAbstractTest.php
@@ -24,7 +24,7 @@ use phpOMS\Utils\TaskSchedule\TaskFactory;
  */
 final class TaskAbstractTest extends \PHPUnit\Framework\TestCase
 {
-    private $class = null;
+    private TaskAbstract $class;
 
     /**
      * {@inheritdoc}