diff --git a/ChangeLog b/ChangeLog
index 42a971fd1b..8b535cf033 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Mar 10 15:53:48 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* version.c (MKSTR): make US-ASCII.  [ruby-dev:34010]
+
 Mon Mar 10 02:08:21 2008  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* string.c (rb_str_index): if t == s + pos, the character beginning
diff --git a/version.c b/version.c
index 1da18951c8..3a1d1fc3ff 100644
--- a/version.c
+++ b/version.c
@@ -14,7 +14,7 @@
 #include <stdio.h>
 
 #define PRINT(type) puts(ruby_##type)
-#define MKSTR(type) rb_obj_freeze(rb_str_new(ruby_##type, sizeof(ruby_##type)-1))
+#define MKSTR(type) rb_obj_freeze(rb_usascii_str_new(ruby_##type, sizeof(ruby_##type)-1))
 
 const char ruby_version[] = RUBY_VERSION;
 const char ruby_release_date[] = RUBY_RELEASE_DATE;