updated for version 7.0073
diff --git a/src/if_mzsch.h b/src/if_mzsch.h
index 88f6a54..98bcf74 100644
--- a/src/if_mzsch.h
+++ b/src/if_mzsch.h
@@ -34,12 +34,13 @@
# endif
# define scheme_format scheme_format_utf8
-# define GET_BYTE_STRING(obj) (SCHEME_BYTE_STRINGP(obj) ? obj : \
+# define SCHEME_GET_BYTE_STRING(obj) (SCHEME_BYTE_STRINGP(obj) ? obj : \
scheme_char_string_to_byte_string(obj))
#else
-# define GET_BYTE_STRING(obj) (obj)
+# define SCHEME_GET_BYTE_STRING(obj) (obj)
# define SCHEME_BYTE_STRLEN_VAL SCHEME_STRLEN_VAL
# define SCHEME_BYTE_STR_VAL SCHEME_STR_VAL
+# define scheme_byte_string_to_char_string(obj) (obj)
#endif
#endif /* _IF_MZSCH_H_ */