diff --git a/ChangeLog b/ChangeLog
index 1a773dcad2..5226dd1c9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Jun  7 18:52:55 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/rubygems/user_interaction.rb (Gem::StreamUI#tty?): IO#tty? of
+	  Windows has been fixed at r29969.
+
+	* test/rubygems/test_gem_stream_ui.rb: now can run tests.
+
 Tue Jun  7 18:36:41 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/rubygems/test_gem.rb (TestGem#{test_self_user_home_userprofile,
diff --git a/lib/rubygems/user_interaction.rb b/lib/rubygems/user_interaction.rb
index 1dbcf38eee..c6665c125f 100644
--- a/lib/rubygems/user_interaction.rb
+++ b/lib/rubygems/user_interaction.rb
@@ -142,12 +142,8 @@ class Gem::StreamUI
   end
 
   def tty?
-    if RUBY_PLATFORM =~ /mingw|mswin/
-      @usetty
-    else
-      @usetty && @ins.tty?
-    end
-  end
+    @usetty && @ins.tty?
+ end
 
   ##
   # Choose from a list of options.  +question+ is a prompt displayed above
diff --git a/test/rubygems/test_gem_stream_ui.rb b/test/rubygems/test_gem_stream_ui.rb
index 4bc6df6f93..2a99af037e 100644
--- a/test/rubygems/test_gem_stream_ui.rb
+++ b/test/rubygems/test_gem_stream_ui.rb
@@ -41,8 +41,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask
-    skip 'TTY detection broken on windows' if Gem.win_platform?
-
     timeout(1) do
       expected_answer = "Arthur, King of the Britons"
       @in.string = "#{expected_answer}\n"
@@ -52,8 +50,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask_no_tty
-    skip 'TTY handling is broken on windows' if Gem.win_platform?
-
     @in.tty = false
 
     timeout(0.1) do
@@ -63,8 +59,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask_for_password
-    skip 'Always uses $stdin on windows' if Gem.win_platform?
-
     timeout(1) do
       expected_answer = "Arthur, King of the Britons"
       @in.string = "#{expected_answer}\n"
@@ -74,8 +68,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask_for_password_no_tty
-    skip 'TTY handling is broken on windows' if Gem.win_platform?
-
     @in.tty = false
 
     timeout(0.1) do
@@ -85,8 +77,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask_yes_no_no_tty_with_default
-    skip 'TTY handling is broken on windows' if Gem.win_platform?
-
     @in.tty = false
 
     timeout(0.1) do
@@ -99,8 +89,6 @@ class TestGemStreamUI < Gem::TestCase
   end
 
   def test_ask_yes_no_no_tty_without_default
-    skip 'TTY handling is broken on windows' if Gem.win_platform?
-
     @in.tty = false
 
     timeout(0.1) do