diff --git a/src/ChangeLog b/src/ChangeLog
index 0f3cdcbcb00..fb12f26239c 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2005-07-16  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+	* mac.c [TARGET_API_MAC_CARBON] (Fmac_code_convert_string): Use
+	Fstring_as_unibyte instead of string_make_unibyte.
+
 2005-07-15  Richard M. Stallman  <rms@gnu.org>
 
 	* xdisp.c (select_frame_for_redisplay): Use find_symbol_value.
diff --git a/src/mac.c b/src/mac.c
index 203b47a1975..b4eb2d53dd5 100644
--- a/src/mac.c
+++ b/src/mac.c
@@ -4144,7 +4144,7 @@ nil.  */)
   src_encoding = get_cfstring_encoding_from_lisp (source);
   tgt_encoding = get_cfstring_encoding_from_lisp (target);
 
-  string = string_make_unibyte (string);
+  string = Fstring_as_unibyte (string);
   if (src_encoding != kCFStringEncodingInvalidId
       && tgt_encoding != kCFStringEncodingInvalidId)
     str = CFStringCreateWithBytes (NULL, SDATA (string), SBYTES (string),