diff --git a/library/Director/Web/Table/ObjectSetTable.php b/library/Director/Web/Table/ObjectSetTable.php
index 2c98c42b..4a209cc8 100644
--- a/library/Director/Web/Table/ObjectSetTable.php
+++ b/library/Director/Web/Table/ObjectSetTable.php
@@ -15,6 +15,7 @@ class ObjectSetTable extends ZfQueryBasedTable
         'os.object_name',
         'os.description',
         'os.assign_filter',
+        'o.object_name',
     ];
 
     private $type;