1 files changed, 1 insertions, 1 deletions

diff --git a/src/charset.h b/src/charset.h
index 86f81fc89e8..dd2d8aa8c90 100644
--- a/src/charset.h
+++ b/src/charset.h
@@ -564,7 +564,7 @@ extern int iso_charset_table[2][2][128];
 #define CHAR_STRING(c, workbuf, str)                    \
   (SINGLE_BYTE_CHAR_P (c)                               \
    ? *(str = workbuf) = (unsigned char)(c), 1           \
-   : non_ascii_char_to_string (c, workbuf, &str))
+   : non_ascii_char_to_string (c, workbuf, (unsigned char **)&str))
 
 /* Return a character code of the character of which multi-byte form
    is at STR and the length is LEN.  If STR doesn't contain valid