diff --git a/mozilla/calendar/base/content/calendar-view-core.xml b/mozilla/calendar/base/content/calendar-view-core.xml
index dba8657cc4d..c9821d3f85a 100644
--- a/mozilla/calendar/base/content/calendar-view-core.xml
+++ b/mozilla/calendar/base/content/calendar-view-core.xml
@@ -232,7 +232,7 @@
           }
 
           var alarmImage = document.getAnonymousElementByAttribute(this, "anonid", "alarm-image");
-          if (item.alarmOffset && getPrefSafe("calendar.alarms.indicator.show", true)) {
+          if ((item.alarmOffset || item.parentItem.alarmOffset) && getPrefSafe("calendar.alarms.indicator.show", true)) {
               alarmImage.removeAttribute("hidden");
           }
         ]]></body>