diff --git a/ChangeLog b/ChangeLog
index 0eccee4efc..7e2bf556f3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue May 31 21:28:33 2011  Tanaka Akira  <akr@fsij.org>
+
+	* test/ruby/test_signal.rb (TestSignal#test_signal_requiring):
+	  redirect stderr to null device.
+
 Thu Jun  2 00:45:26 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/extconf.rb: fix for uninitialized global variables.
diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 8cdaffb7d3..94f527f277 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -202,7 +202,7 @@ class TestSignal < Test::Unit::TestCase
     t = Tempfile.new(%w"require_ensure_test .rb")
     t.puts "sleep"
     t.close
-    error = IO.popen([EnvUtil.rubybin, "-e", <<EOS, t.path]) do |child|
+    error = IO.popen([EnvUtil.rubybin, "-e", <<EOS, t.path, :err => File::NULL]) do |child|
 trap(:INT, "DEFAULT")
 th = Thread.new do
   begin