diff --git a/ChangeLog b/ChangeLog
index 950d71381d..08f19f5472 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Mar 14 16:41:55 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/test_tmpdir.rb (TestTmpdir#test_world_writable): skip on Windows.
+
 Wed Mar 14 15:09:23 2012  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* numeric.c: fix flodivmod for cornercases [Bug #6044]
diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index 9ef22e3f55..c48b4b7fb2 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -3,6 +3,7 @@ require 'tmpdir'
 
 class TestTmpdir < Test::Unit::TestCase
   def test_world_writable
+    skip "no meaning on this platform" if /mswin|mingw/ =~ RUBY_PLATFORM
     Dir.mktmpdir do |tmpdir|
       # ToDo: fix for parallel test
       olddir, ENV["TMPDIR"] = ENV["TMPDIR"], tmpdir