--- less-474/line.c	2015-01-31 00:20:29.000000000 +0100
+++ less-475/line.c	2015-03-05 20:07:08.000000000 +0100
@@ -807,7 +807,7 @@
 			mbc_buf[mbc_buf_index++] = c;
 			if (mbc_buf_index < mbc_buf_len)
 				return (0);
-			if (is_utf8_well_formed(mbc_buf))
+			if (is_utf8_well_formed(mbc_buf, mbc_buf_index))
 				r = do_append(get_wchar(mbc_buf), mbc_buf, mbc_pos);
 			else
 				/* Complete, but not shortest form, sequence. */