diff --git a/ChangeLog b/ChangeLog
index b9ae779234..ef67232b3c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep  3 12:40:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* intern.h (rb_usascii_str_new): macros for forward compatibility.
+
 Tue Aug 31 17:32:34 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/stubs.c: fix [Bug #3771] "VC++ can't make ext/tk with enabling
diff --git a/intern.h b/intern.h
index d84d02110e..db49fa7d4e 100644
--- a/intern.h
+++ b/intern.h
@@ -450,6 +450,9 @@ VALUE rb_str_tmp_new _((long));
 VALUE rb_str_buf_append _((VALUE, VALUE));
 VALUE rb_str_buf_cat _((VALUE, const char*, long));
 VALUE rb_str_buf_cat2 _((VALUE, const char*));
+#define rb_usascii_str_new rb_str_new
+#define rb_usascii_str_new_cstr rb_str_new_cstr
+#define rb_usascii_str_new2 rb_str_new2
 VALUE rb_obj_as_string _((VALUE));
 VALUE rb_check_string_type _((VALUE));
 VALUE rb_str_dup _((VALUE));