diff --git a/usr.bin/calendar/calendars/calendar.history b/usr.bin/calendar/calendars/calendar.history
index ac25a85ad1ef..97b01d782f91 100644
--- a/usr.bin/calendar/calendars/calendar.history
+++ b/usr.bin/calendar/calendars/calendar.history
@@ -105,7 +105,6 @@
 04/07	Albert Hofmann synthesizes LSD in Switzerland, 1943
 04/07	Alewives run, Cape Cod
 04/09	Lee surrenders to Grant at Appomattox Courthouse, 1865
-04/12	Columbia launched, 1981
 04/12	Confederate troops fire first shots of Civil War at Ft Sumter, 1861
 04/12	Space Shuttle Columbia launched, 1981
 04/12	Yuri Gagarin becomes the first man in space, 1961