diff --git a/modules/monitoring/library/Monitoring/Command/Common/ScheduleDowntimeCommand.php b/modules/monitoring/library/Monitoring/Command/Common/ScheduleDowntimeCommand.php
index 67713c425..0afb4087a 100644
--- a/modules/monitoring/library/Monitoring/Command/Common/ScheduleDowntimeCommand.php
+++ b/modules/monitoring/library/Monitoring/Command/Common/ScheduleDowntimeCommand.php
@@ -9,7 +9,7 @@ use DateTime;
 /**
  * Base class for commands scheduling downtimes
  */
-abstract class ScheduleDowntimeCommand extends Comment
+abstract class ScheduleDowntimeCommand extends AddCommentCommand
 {
     /**
      * Downtime starts at the exact time specified