diff --git a/ChangeLog b/ChangeLog
index 1eaddc5728..51f42a6b1e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon May 16 00:32:05 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* test/ruby/test_signal.rb (TestSignal#test_signal_process_group):
+	  skip if the platform doesn't have :pgroup capability. (i.e. skip
+	  if mswin32)
+
 Sun May 15 23:53:31 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* include/ruby/intern.h: resurrect old rb_fd_copy().
diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 2b2d88b06f..26e17b3b64 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -38,6 +38,8 @@ class TestSignal < Test::Unit::TestCase
 
   def test_signal_process_group
     return unless Process.respond_to?(:kill)
+    return unless Process.respond_to?(:pgroup) # for mswin32
+
     bug4362 = '[ruby-dev:43169]'
     assert_nothing_raised(bug4362) do
       pid = Process.spawn(EnvUtil.rubybin, '-e', '"sleep 10"', :pgroup => true)