diff --git a/usr.bin/calendar/calendars/calendar.australia b/usr.bin/calendar/calendars/calendar.australia
index daa07ff26d50..d0865349f7b3 100644
--- a/usr.bin/calendar/calendars/calendar.australia
+++ b/usr.bin/calendar/calendars/calendar.australia
@@ -17,7 +17,7 @@ Jun/MonSecond	Queen's Birthday Holiday (Australia, except WA)
 Oct/SunFirst	Daylight Savings Time starts in ACT, NSW, SA and VIC.
 
 /* ACT, NSW, common */
-Mar 18		Canberra Day (ACT)
+Mar/MonSecond	Canberra Day (ACT)
 Sep/MonLast	Family & Community Day (ACT)
 Aug/MonFirst	Bank Holiday (ACT, NSW)
 Oct/MonFirst	Labour Day (ACT, NSW, SA)