diff --git a/ChangeLog b/ChangeLog
index 773026956d..c2af39703e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+Wed Jun 16 00:04:38 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* test/ruby/test_io.rb (safe_4): does not use Timeout because
+	  Timeout.timeout uses Thread#kill which raises SecurityError when
+	  $SAFE == 4.  based on a patch from Tomoyuki Chikanaga.
+	  [ruby-dev:41484]
+
+	* test/ruby/test_io.rb (test_print_separators): use pipe (test helper
+	  method) instead of IO.pipe.  [ruby-dev:41484]
+
 Tue Jun 15 17:14:58 2010  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* ext/fiddle/extconf.rb: De Morgan's laws.
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 57a7c7c9a4..41d3640105 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -740,12 +740,14 @@ class TestIO < Test::Unit::TestCase
   end
 
   def safe_4
-    Thread.new do
-      Timeout.timeout(10) do
-        $SAFE = 4
-        yield
-      end
-    end.join
+    t = Thread.new do
+      $SAFE = 4
+      yield
+    end
+    unless t.join(10)
+      t.kill
+      flunk("timeout in safe_4")
+    end
   end
 
   def pipe(wp, rp)
@@ -1461,15 +1463,16 @@ End
   def test_print_separators
     $, = ':'
     $\ = "\n"
-    r, w = IO.pipe
-    w.print('a')
-    w.print('a','b','c')
-    w.close
-    assert_equal("a\n", r.gets)
-    assert_equal("a:b:c\n", r.gets)
-    assert_nil r.gets
-    r.close
-    
+    pipe(proc do |w|
+      w.print('a')
+      w.print('a','b','c')
+      w.close
+    end, proc do |r|
+      assert_equal("a\n", r.gets)
+      assert_equal("a:b:c\n", r.gets)
+      assert_nil r.gets
+      r.close
+    end)
   ensure
     $, = nil
     $\ = nil