diff --git a/ChangeLog b/ChangeLog
index 47e501e459..e61a82e829 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Feb 22 22:11:58 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/io/console/console.c (console_dev): need read access for conout$
+	  because some functions need it.  [Bug#9554]
+
 Sat Feb 22 14:01:42 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* iseq.c (iseq_load): keep type_map to get rid of memory leak.
diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index cab8207ce7..270ae3deaf 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -686,7 +686,7 @@ console_dev(VALUE klass)
 	int fd;
 
 #ifdef CONSOLE_DEVICE_FOR_WRITING
-	fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_WRITING, O_WRONLY, 0);
+	fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_WRITING, O_RDWR, 0);
 	if (fd < 0) return Qnil;
         rb_update_max_fd(fd);
 	args[1] = INT2FIX(O_WRONLY);
diff --git a/version.h b/version.h
index 56c4237ef3..f3ce1b7c9c 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2014-02-22"
-#define RUBY_PATCHLEVEL 449
+#define RUBY_PATCHLEVEL 450
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 2