using common layout for all the pages in pug

I am trying out pug with express

views/layout.pug 

doctype html
html
  head
    title= title
    link(rel="shortcut icon", href="favicon.ico", type="image/x-icon")
    link(rel='stylesheet', href='/assets/application.css')
    link(rel='stylesheet', href="assets/libs/bootstrap/dist/css/bootstrap.min.css")
  body    
    script(src="assets/libs/jquery/dist/jquery.min.js")
    script(src='assets/libs/bootstrap/dist/js/bootstrap.min.js')
    script(src="assets/application.js")
    block content

This is the router for User page.

routes/user.js

var express = require('express');
var router = express.Router();

/* GET users listing. */
router.get('/', function(req, res, next) {
  res.render('user/index');
});

module.exports = router;

I have my view for user/index page. I extends the layout from the view. User index page using the layout. layout.pug is present in views folder.

/views/user/index.pug

extends layout

h1
 | User index

i get the following error. it is looking for layout in view/user folder. How to make it to use view/layout.pug.

Error: ENOENT: no such file or directory, open 'C:\my_projects\myexpressapp\views\user\layout.pug'
    at C:\my_projects\myexpressapp\views\user\index.pug line 1
    at Error (native)
    at Object.fs.openSync (fs.js:640:18)
    at Object.fs.readFileSync (fs.js:508:33)
    at Function.read (C:\my_projects\myexpressapp\node_modules\pug-load\index.js:69:13)
    at Object.read (C:\my_projects\myexpressapp\node_modules\pug\lib\index.js:147:25)
    at C:\my_projects\myexpressapp\node_modules\pug-load\index.js:24:25
    at walkAST (C:\my_projects\myexpressapp\node_modules\pug-walk\index.js:23:18)
    at C:\my_projects\myexpressapp\node_modules\pug-walk\index.js:104:20
    at Array.reduce (native)
    at walkAndMergeNodes (C:\my_projects\myexpressapp\node_modules\pug-walk\index.js:103:18)

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