diff --git a/lib/build/index.js b/lib/build/index.js
index 20e7bf14a8..5d0d571c4d 100644
--- a/lib/build/index.js
+++ b/lib/build/index.js
@@ -116,6 +116,7 @@ exports.build = function * () {
   /*
   ** Generate .nuxt/dist/ files
   */
+  /* istanbul ignore if */
   if (this.dev) {
     debug('Adding webpack middlewares...')
     createWebpackMiddlewares.call(this)
@@ -254,6 +255,7 @@ function getWebpackServerConfig () {
   return serverWebpackConfig.call(this)
 }
 
+/* istanbul ignore next */
 function createWebpackMiddlewares () {
   const clientConfig = getWebpackClientConfig.call(this)
   // setup on the fly compilation + hot-reload
@@ -276,6 +278,7 @@ function createWebpackMiddlewares () {
   this.webpackHotMiddleware = pify(require('webpack-hot-middleware')(clientCompiler))
 }
 
+/* istanbul ignore next */
 function webpackWatchAndUpdate () {
   const MFS = require('memory-fs') // <- dependencies of webpack
   const mfs = new MFS()
@@ -338,6 +341,7 @@ function createRenderer (bundle) {
   this.renderToStream = this.renderer.renderToStream
 }
 
+/* istanbul ignore next */
 function watchPages () {
   const patterns = [ r(this.srcDir, 'pages/*.vue'), r(this.srcDir, 'pages/**/*.vue') ]
   const options = {