diff --git a/ChangeLog b/ChangeLog
index 4c3e324051..1c9b1e8794 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Sep  1 10:20:50 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/ruby/test_io_m17n.rb (TestIO_M17N#test_{default_mode_on_dosish,
+	  default_mode_on_unix,text_mode,binary_mode}): sorry for wrong test
+	  committed in r33144.  I'd misunderstood the spec of ruby's universal
+	  newline.
+
 Thu Sep  1 09:27:57 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* variable.c (rb_autoloading_value) Fix the order of definitions.
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 01dca47f7f..f62ded90cb 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -2072,29 +2072,29 @@ EOT
 
   def test_default_mode_on_dosish
     with_tmpdir {
-      open("a", "w") {|f| f.puts}
+      open("a", "w") {|f| f.write "\n"}
       assert_equal("\r\n", IO.binread("a"))
     }
   end if /mswin|mingw/ =~ RUBY_PLATFORM
 
   def test_default_mode_on_unix
     with_tmpdir {
-      open("a", "w") {|f| f.puts}
+      open("a", "w") {|f| f.write "\n"}
       assert_equal("\n", IO.binread("a"))
     }
   end unless /mswin|mingw/ =~ RUBY_PLATFORM
 
   def test_text_mode
     with_tmpdir {
-      open("a", "wt") {|f| f.puts}
-      assert_equal("\r\n", IO.binread("a"))
+      open("a", "wb") {|f| f.write "\r\n"}
+      assert_equal("\n", open("a", "rt"){|f| f.read})
     }
   end
 
   def test_binary_mode
     with_tmpdir {
-      open("a", "wb") {|f| f.puts}
-      assert_equal("\n", IO.binread("a"))
+      open("a", "wb") {|f| f.write "\r\n"}
+      assert_equal("\r\n", open("a", "rb"){|f| f.read})
     }
   end
 end