diff --git a/calendar/base/src/calEvent.js b/calendar/base/src/calEvent.js
index ba170329b83..d05c4e786a9 100644
--- a/calendar/base/src/calEvent.js
+++ b/calendar/base/src/calEvent.js
@@ -68,6 +68,7 @@ calEvent.prototype = {
         this.cloneItemBaseInto(m);
         m.mStartDate = this.mStartDate.clone();
         m.mEndDate = this.mEndDate.clone();
+        m.isAllDay = this.isAllDay;
 
         return m;
     },
diff --git a/calendar/resources/content/monthView.js b/calendar/resources/content/monthView.js
index ffe0b923609..09f729ab619 100644
--- a/calendar/resources/content/monthView.js
+++ b/calendar/resources/content/monthView.js
@@ -287,7 +287,7 @@ MonthView.prototype.createEventBox = function(itemOccurrence)
     eventBoxText.setAttribute("crop", "end");
     eventBoxText.setAttribute("class", "month-day-event-text-class");
 
-    if (itemOccurrence.isAllDay) {
+    if (calEvent.isAllDay) {
         eventBox.setAttribute("allday", "true");
         eventBoxText.setAttribute("value", itemOccurrence.title );
         // Create an image