diff --git a/ChangeLog b/ChangeLog
index 59c0701a2e..611ef8c399 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Feb 23 18:50:17 2008  Masaki Suketa  <masaki.suketa@nifty.ne.jp>
+
+	* ext/win32ole/win32ole.c (ole_encoding2cp): remove US-ASCII
+	  mapping.
+
 Sat Feb 23 01:09:47 2008  Tanaka Akira  <akr@fsij.org>
 
 	* process.c (rlimit_resource_type): new function.
diff --git a/ext/win32ole/win32ole.c b/ext/win32ole/win32ole.c
index e681f48385..15f8e7ea24 100644
--- a/ext/win32ole/win32ole.c
+++ b/ext/win32ole/win32ole.c
@@ -819,7 +819,6 @@ static UINT ole_encoding2cp(rb_encoding *enc)
     ENC_MACHING_CP(enc, "KOI8-R", 20866);
     ENC_MACHING_CP(enc, "KOI8-U", 21866);
     ENC_MACHING_CP(enc, "Shift_JIS", 932);
-    ENC_MACHING_CP(enc, "US-ASCII", 20127);
     ENC_MACHING_CP(enc, "UTF-16BE", 1201);
     ENC_MACHING_CP(enc, "UTF-16LE", 1200);
     ENC_MACHING_CP(enc, "UTF-7", 65000);