diff --git a/calendar/inc/class.calendar_ui.inc.php b/calendar/inc/class.calendar_ui.inc.php
index a1a02bd629..4644d8312b 100644
--- a/calendar/inc/class.calendar_ui.inc.php
+++ b/calendar/inc/class.calendar_ui.inc.php
@@ -511,7 +511,7 @@ class calendar_ui
 	function popup($link,$target='_blank',$width=750,$height=410)
  	{
 		return 'egw_openWindowCentered2('.($link == 'this.href' ? $link : "'".$link."'").','.
-			($target == 'this.target' ? $target : "'".$target."'").",$width,$height,'yes','calendar')";
+			($target == 'this.target' ? $target : "'".$target."'").",$width,$height,'yes')";
  	}
 
 	/**