diff --git a/ChangeLog b/ChangeLog
index 53f8d1e364..64744d001c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 20 05:03:46 2008  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ascii.c: remove difinition of replica KOI8-U.
+
 Sun Jan 20 00:33:59 2008  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* enc/koi8_u.c: added.
diff --git a/enc/ascii.c b/enc/ascii.c
index c52ebd03df..a74dcb0ec7 100644
--- a/enc/ascii.c
+++ b/enc/ascii.c
@@ -80,8 +80,7 @@ ENC_REPLICATE("IBM869", "ASCII-8BIT");
 ENC_ALIAS("CP869", "IBM869");
 ENC_REPLICATE("Windows-1258", "ASCII-8BIT");
 ENC_ALIAS("CP1258", "Windows-1258");
-ENC_REPLICATE("gb1988", "ASCII-8BIT");
-ENC_REPLICATE("koi8-u", "ASCII-8BIT");
+ENC_REPLICATE("GB1988", "ASCII-8BIT");
 ENC_REPLICATE("macCentEuro", "ASCII-8BIT");
 ENC_REPLICATE("macCroatian", "ASCII-8BIT");
 ENC_REPLICATE("macCyrillic", "ASCII-8BIT");