diff --git a/games/morse/morse.6 b/games/morse/morse.6
index 6b7f70835f35..65752e4b2ed8 100644
--- a/games/morse/morse.6
+++ b/games/morse/morse.6
@@ -146,7 +146,7 @@ If one of these variables (in this priority) is set to a locale ending in
 characters with the high-order bit set are being interpreted as
 Cyrillic characters.  In all other cases, they are being interpreted
 as belonging to the
-.Ql ISO_8859-1
+.Ql ISO-8859-1
 character set.
 .El
 .Sh SEE ALSO