diff --git a/ChangeLog b/ChangeLog
index c7b78432ae..4411581cf2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Dec 25 13:54:01 2007  Tanaka Akira  <akr@fsij.org>
+
+	* test/ruby/test_io_m17n.rb (test_pipe): fixed.
+	  [ruby-dev:32743]
+
 Tue Dec 25 13:44:51 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* thread.c (rb_thread_wait_fd_rw): should check EBADF on select().
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index d3de901f6f..9a8236a5c3 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -342,7 +342,7 @@ EOT
       w.close
       s = r.read
       assert_equal(Encoding.default_external, s.encoding)
-      assert_str_equal(utf8, s)
+      assert_str_equal(utf8.dup.force_encoding(Encoding.default_external), s)
     }
 
     with_pipe("EUC-JP") {|r,w|