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-rw-r--r--src/nvim/macros.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/macros.h b/src/nvim/macros.h
index 46f591eb33..c637351c84 100644
--- a/src/nvim/macros.h
+++ b/src/nvim/macros.h
@@ -133,7 +133,7 @@
# define mb_cptr_adv(p) p += \
enc_utf8 ? utf_ptr2len(p) : has_mbyte ? (*mb_ptr2len)(p) : 1
/* Backup multi-byte pointer. Only use with "p" > "s" ! */
-# define mb_ptr_back(s, p) p -= has_mbyte ? ((*mb_head_off)(s, p - 1) + 1) : 1
+# define mb_ptr_back(s, p) p -= has_mbyte ? ((*mb_head_off)((char_u *)s, (char_u *)p - 1) + 1) : 1
/* get length of multi-byte char, not including composing chars */
# define mb_cptr2len(p) (enc_utf8 ? utf_ptr2len(p) : (*mb_ptr2len)(p))