diff --git a/calendar/sunbird/themes/winstripe/sunbird/calendar.css b/calendar/sunbird/themes/winstripe/sunbird/calendar.css
index ae74fe093f4c..3a4588434a8a 100644
--- a/calendar/sunbird/themes/winstripe/sunbird/calendar.css
+++ b/calendar/sunbird/themes/winstripe/sunbird/calendar.css
@@ -754,7 +754,20 @@ toolbar[iconsize="small"] #calendar-new-task-button:hover:active {
   padding: 0px !important;
   min-width: 0;
   background-color: transparent;
-  list-style-image: url('chrome://calendar/content/sunbird_small.png');
+  list-style-image: url('chrome://calendar/skin/Throbber.png');
+}
+
+#navigator-throbber[busy="true"] {
+  list-style-image: url('chrome://calendar/skin/Throbber.gif');
+  -moz-opacity: 0.5;
+}
+
+toolbar[iconsize="small"] #navigator-throbber {
+  list-style-image: url('chrome://calendar/skin/Throbber-small.png');
+}
+
+toolbar[iconsize="small"] #navigator-throbber[busy="true"] {
+  list-style-image: url('chrome://calendar/skin/Throbber-small.gif');
 }
 
 /*--------------------------------------------------------------------