diff --git a/webseite/classes/TopicData.php b/webseite/classes/TopicData.php
index 3c2cb89..fdd3b33 100644
--- a/webseite/classes/TopicData.php
+++ b/webseite/classes/TopicData.php
@@ -3,6 +3,7 @@
 use exception\SubjectDoesNotExistException;
 use exception\TopicAlreadyExistsException;
 
+require_once("Task.php");
 require_once("Config.php");
 require_once("Util.php");