diff --git a/library/Icingadb/Model/Timeperiod.php b/library/Icingadb/Model/Timeperiod.php
index e1664103b..34ff55096 100644
--- a/library/Icingadb/Model/Timeperiod.php
+++ b/library/Icingadb/Model/Timeperiod.php
@@ -98,5 +98,6 @@ public function createRelations(Relations $relations)
         $relations->hasMany('service', Service::class)
             ->setForeignKey('check_timeperiod_id');
         $relations->hasMany('user', User::class);
+        $relations->hasMany('dependency', Dependency::class);
     }
 }