diff --git calendar-impl/impl/src/java/org/sakaiproject/calendar/impl/BaseCalendarService.java calendar-impl/impl/src/java/org/sakaiproject/calendar/impl/BaseCalendarService.java
index 304a11e..b2450cd 100644
--- calendar-impl/impl/src/java/org/sakaiproject/calendar/impl/BaseCalendarService.java
+++ calendar-impl/impl/src/java/org/sakaiproject/calendar/impl/BaseCalendarService.java
@@ -6927,11 +6927,12 @@ public abstract class BaseCalendarService implements CalendarService, StorageUse
 		ical.getComponents().add(registry.getTimeZone(tzId.getValue()).getVTimeZone());
 		
 		CalendarOutputter icalOut = new CalendarOutputter();
-		generateICal(ical, calRefs);
+		int numEvents = generateICal(ical, calRefs);
 			
 		try 
 		{
-			icalOut.output( ical, os );
+			if ( numEvents > 0 )
+				icalOut.output( ical, os );
 		}
 		catch (Exception e)
 		{