diff --git a/plugins/ktcore/KTColumns.inc.php b/plugins/ktcore/KTColumns.inc.php
index 14bbb40..bdd8aef 100644
--- a/plugins/ktcore/KTColumns.inc.php
+++ b/plugins/ktcore/KTColumns.inc.php
@@ -420,6 +420,10 @@ class AdvancedDownloadColumn extends AdvancedColumn {
         $this->label = null;
     }
 
+    function renderHeader($sReturnURL) {
+        return ' ';
+    }
+
     function renderData($aDataRow) {
         // only _ever_ show this for documents.
         if ($aDataRow["type"] === "folder") {