===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/less/cvt.c,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- src/usr.bin/less/cvt.c	2019/05/15 18:18:08	1.10
+++ src/usr.bin/less/cvt.c	2019/05/15 19:06:01	1.11
@@ -78,8 +78,7 @@
 			/* Delete backspace and preceding char. */
 			do {
 				dst--;
-			} while (dst > odst &&
-			    !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
+			} while (dst > odst && IS_UTF8_TRAIL(*dst));
 		} else if ((ops & CVT_ANSI) && ch == ESC) {
 			/* Skip to end of ANSI escape sequence. */
 			src++;	/* skip the CSI start char */