diff --git a/ChangeLog b/ChangeLog
index 658708f718..3f3b009d5d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Sat Jan 28 07:28:48 2012  Hiroshi Shirosaki  <h.shirosaki@gmail.com>
+
+	* test/zlib/test_zlib.rb (TestZlibGzipReader#test_reader_wrap): set
+	  binmode explicitly for fixing test error on Windows. This is consistent
+	  with r34243.
+	  [ruby-dev:45149] [Bug #5812]
+
 Sat Jan 28 05:53:34 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/irb/completion.rb (IRB::InputCompletor::CompletionProc):
diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index 4149c8aa8e..8c2fbde8d9 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -691,6 +691,7 @@ if defined? Zlib
       t.close
       Zlib::GzipWriter.open(t.path) {|gz| gz.print("foo") }
       f = open(t.path)
+      f.binmode
       assert_equal("foo", Zlib::GzipReader.wrap(f) {|gz| gz.read })
       assert_raise(IOError) { f.close }
     end