1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/diff.c b/src/nvim/diff.c
index db3ef7ac47..34cac5a098 100644
--- a/src/nvim/diff.c
+++ b/src/nvim/diff.c
@@ -724,7 +724,7 @@ static int diff_write_buffer(buf_T *buf, diffin_T *din)
 
         c = PTR2CHAR(s);
         c = enc_utf8 ? utf_fold(c) : TOLOWER_LOC(c);
-        orig_len = MB_PTR2LEN(s);
+        orig_len = utfc_ptr2len(s);
         if (utf_char2bytes(c, cbuf) != orig_len) {
           // TODO(Bram): handle byte length difference
           memmove(ptr + len, s, orig_len);