diff --git a/ChangeLog b/ChangeLog
index 94f231b673..bfc60af5c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Nov  2 00:25:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/socket/extconf.rb: win64 is just same with win32 about socket.
+	  notice: but wince is not same.
+
 Mon Nov  1 21:25:57 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
 
 	* main.c: <stdlib.h> is needed, to introduce the getenv(3)
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index a6bc9bb46c..6d768f8d89 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -1,7 +1,7 @@
 require 'mkmf'
 
 case RUBY_PLATFORM
-when /(ms|bcc)win32|mingw/
+when /(ms|bcc)win(32|64)|mingw/
   test_func = "WSACleanup"
   have_library("ws2_32", "WSACleanup")
   $defs << "-DHAVE_SOCKETPAIR"