===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/less/cmdbuf.c,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -r1.17 -r1.18
--- src/usr.bin/less/cmdbuf.c	2019/05/15 18:06:09	1.17
+++ src/usr.bin/less/cmdbuf.c	2019/05/15 19:06:01	1.18
@@ -1069,7 +1069,7 @@
 retry:
 			cmd_mbc_buf_index = 1;
 			*cmd_mbc_buf = c & 0xff;
-			if (IS_ASCII_OCTET(c))
+			if (isascii((unsigned char)c))
 				cmd_mbc_buf_len = 1;
 			else if (IS_UTF8_LEAD(c)) {
 				cmd_mbc_buf_len = utf_len(c);