diff --git a/usr.bin/calendar/calendars/calendar.birthday b/usr.bin/calendar/calendars/calendar.birthday
index f4a794cd6b44..51745e36f3aa 100644
--- a/usr.bin/calendar/calendars/calendar.birthday
+++ b/usr.bin/calendar/calendars/calendar.birthday
@@ -120,7 +120,7 @@
 04/10	William Booth born, 1829, founder of the Salvation Army
 04/13	Thomas Jefferson, 3rd President of the United States, born Shadwell
 		Plantation, Albemarle County, Virginia, 1743
-04/14	Christiaan Huygen born, 1629, physicist & astronomer;
+04/14	Christiaan Huygens born, 1629, physicist & astronomer;
 		discovered Saturn's rings
 04/15	Leonardo da Vinci born, 1452
 04/16	Charles (Charlie) Chaplin (Sir) born in London, 1889