diff --git a/ChangeLog b/ChangeLog
index 62c5239720..914c26ca71 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct 22 08:21:09 2014  Yuki Yugui Sonoda  <yugui@yugui.jp>
+
+	* nacl/pepper_main.c (Instance_DidCreate): mount devfs and rebind fd 0
+	  .. 2 so that stderr goes to the console of the browser.
+
 Wed Oct 22 03:47:43 2014  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* ext/etc/etc.c (etc_nprocessors_affin): maximum "n" should be 16384.
diff --git a/nacl/pepper_main.c b/nacl/pepper_main.c
index bcb128ded1..168e8f9fd4 100644
--- a/nacl/pepper_main.c
+++ b/nacl/pepper_main.c
@@ -404,6 +404,24 @@ init_libraries_if_necessary(void)
   return 0;
 }
 
+static int
+reopen_fd(int fd, const char* path, int flags) {
+  int fd2 = open(path, flags);
+  if (fd2 < 0) {
+    perror("open fd");
+    return -1;
+  }
+  if (dup2(fd2, fd) < 0) {
+    perror("dup2 fd");
+    return -1;
+  }
+  if (close(fd2)) {
+    perror("close old fd");
+    return -1;
+  }
+  return fd;
+}
+
 static int
 pruby_init(void)
 {
@@ -490,13 +508,29 @@ static PP_Bool
 Instance_DidCreate(PP_Instance instance,
                    uint32_t argc, const char* argn[], const char* argv[])
 {
-  int ret;
   struct PepperInstance* data = pruby_register_instance(instance);
   current_instance = instance;
 
   nacl_io_init_ppapi(instance, get_browser_interface);
 
-  // TODO(yugui) Mount devfs
+  if (mount("", "/dev2", "dev", 0, "")) {
+    perror("mount dev");
+    return PP_FALSE;
+  }
+  if (reopen_fd(0, "/dev2/stdin", O_RDONLY) < 0) {
+    perror("reopen stdin");
+    return PP_FALSE;
+  }
+  if (reopen_fd(1, "/dev2/stdout", O_WRONLY) < 0) {
+    perror("reopen stdout");
+    return PP_FALSE;
+  }
+  if (reopen_fd(2, "/dev2/console1", O_WRONLY) < 0) {
+    perror("reopen stderr");
+    return PP_FALSE;
+  }
+
+  /* TODO(yugui) Unmount original /dev */
 
   if (mount("/lib", "/lib", "httpfs",
         0, "allow_cross_origin_requests=false")) {