diff --git a/ChangeLog b/ChangeLog
index a402f2e553..d1cd49098b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jan  8 23:55:15 2008  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* encoding.c (rb_enc_init): UTF-{16,32}{BE,LE} are not builtin.
+
 Tue Jan  8 22:33:03 2008  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* encoding.c, Makefile.in, include/ruby/oniguruma.h,
diff --git a/encoding.c b/encoding.c
index a46e133acf..fc7fa37e24 100644
--- a/encoding.c
+++ b/encoding.c
@@ -295,10 +295,6 @@ enum {
     ENCINDEX_EUC_JP,
     ENCINDEX_SJIS,
     ENCINDEX_UTF8,
-    ENCINDEX_UTF_16BE,
-    ENCINDEX_UTF_16LE,
-    ENCINDEX_UTF_32BE,
-    ENCINDEX_UTF_32LE,
     ENCINDEX_BUILTIN_MAX
 };
 
@@ -311,10 +307,6 @@ rb_enc_init(void)
     ENC_REGISTER(EUC_JP);
     ENC_REGISTER(SJIS);
     ENC_REGISTER(UTF8);
-    ENC_REGISTER(UTF_16BE);
-    ENC_REGISTER(UTF_16LE);
-    ENC_REGISTER(UTF_32BE);
-    ENC_REGISTER(UTF_32LE);
 #undef ENC_REGISTER
     enc_alias("ASCII", rb_enc_name(ONIG_ENCODING_ASCII));
     enc_alias("BINARY", rb_enc_name(ONIG_ENCODING_ASCII));