diff --git a/calendar/inc/class.calendar_uilist.inc.php b/calendar/inc/class.calendar_uilist.inc.php
index 1ceb82cbd8..1674d251cc 100644
--- a/calendar/inc/class.calendar_uilist.inc.php
+++ b/calendar/inc/class.calendar_uilist.inc.php
@@ -383,14 +383,14 @@ class calendar_uilist extends calendar_ui
 			$col_filter = array();
 			foreach($params['col_filter'] as $name => $val)
 			{
-				if ($name != 'participants' && (string)$val !== '')
+				if (!in_array($name, array('participant','row_id')) && (string)$val !== '')
 				{
 					$col_filter[$name] = $val;
 				}
 			}
 		}
 		$rows = $js_integration_data = array();
-		
+
 		foreach((array) $this->bo->search($search_params, !empty($col_filter) ? $col_filter : null) as $event)
 		{
 			$this->to_client($event);