diff --git a/ChangeLog b/ChangeLog
index afe340b179..a5abd3d37f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jan 18 07:06:25 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* io.c (Init_IO): stdin/stdout may not be duplex.
+
 Fri Jan 18 04:27:57 2008  Eric Hodel  <drbrain@segment7.net>
 
 	* sample/rdoc/markup/rdoc2latex.rb:  Fix for new namespacing.
diff --git a/io.c b/io.c
index 734799a83a..1206b9bcaa 100644
--- a/io.c
+++ b/io.c
@@ -6652,7 +6652,6 @@ Init_IO(void)
     rb_define_hooked_variable("$>", &rb_stdout, 0, stdout_setter);
     orig_stdout = rb_stdout;
     rb_deferr = orig_stderr = rb_stderr;
-    RFILE(rb_stdin)->fptr->tied_io_for_writing = rb_stdout;
 
     /* constants to hold original stdin/stdout/stderr */
     rb_define_global_const("STDIN", rb_stdin);