diff --git a/library/Director/Objects/IcingaTimePeriod.php b/library/Director/Objects/IcingaTimePeriod.php
index d69707fa..3cfa29eb 100644
--- a/library/Director/Objects/IcingaTimePeriod.php
+++ b/library/Director/Objects/IcingaTimePeriod.php
@@ -22,6 +22,10 @@ class IcingaTimePeriod extends IcingaObject
 
     protected $supportsRanges = true;
 
+    protected $relations = array(
+        'zone' => 'IcingaZone',
+    );
+
     /**
      * Render update property
      *
diff --git a/library/Director/Objects/IcingaUser.php b/library/Director/Objects/IcingaUser.php
index 237d4856..c50a2312 100644
--- a/library/Director/Objects/IcingaUser.php
+++ b/library/Director/Objects/IcingaUser.php
@@ -35,4 +35,9 @@ class IcingaUser extends IcingaObject
         'states' => 'StateFilterSet',
         'types'  => 'TypeFilterSet',
     );
+
+    protected $relations = array(
+        'period' => 'IcingaTimePeriod',
+        'zone'   => 'IcingaZone',
+    );
 }