diff --git a/spec/api-browser-window-spec.js b/spec/api-browser-window-spec.js
index 81d512212c39..354befdb3f4b 100644
--- a/spec/api-browser-window-spec.js
+++ b/spec/api-browser-window-spec.js
@@ -801,8 +801,9 @@ describe('BrowserWindow module', function () {
     describe('"node-integration" option', function () {
       it('disables node integration when specified to false', function (done) {
         var preload = path.join(fixtures, 'module', 'send-later.js')
-        ipcMain.once('answer', function (event, test) {
-          assert.equal(test, 'undefined')
+        ipcMain.once('answer', function (event, typeofProcess, typeofBuffer) {
+          assert.equal(typeofProcess, 'undefined')
+          assert.equal(typeofBuffer, 'undefined')
           done()
         })
         w.destroy()
diff --git a/spec/fixtures/module/preload-node-off.js b/spec/fixtures/module/preload-node-off.js
index 54fe343a9ca0..452ee41b68b3 100644
--- a/spec/fixtures/module/preload-node-off.js
+++ b/spec/fixtures/module/preload-node-off.js
@@ -1,6 +1,6 @@
 setImmediate(function () {
   try {
-    console.log([typeof process, typeof setImmediate, typeof global].join(' '))
+    console.log([typeof process, typeof setImmediate, typeof global, typeof Buffer].join(' '))
   } catch (e) {
     console.log(e.message)
   }
diff --git a/spec/fixtures/module/preload.js b/spec/fixtures/module/preload.js
index 39c8b11fbe38..e9dad8ac99bb 100644
--- a/spec/fixtures/module/preload.js
+++ b/spec/fixtures/module/preload.js
@@ -1 +1 @@
-console.log([typeof require, typeof module, typeof process].join(' '))
+console.log([typeof require, typeof module, typeof process, typeof Buffer].join(' '))
diff --git a/spec/fixtures/module/send-later.js b/spec/fixtures/module/send-later.js
index 8eb16f72f8cc..2d3156faaa7d 100644
--- a/spec/fixtures/module/send-later.js
+++ b/spec/fixtures/module/send-later.js
@@ -1,4 +1,4 @@
 var ipcRenderer = require('electron').ipcRenderer
 window.onload = function () {
-  ipcRenderer.send('answer', typeof window.process)
+  ipcRenderer.send('answer', typeof window.process, typeof window.Buffer)
 }
diff --git a/spec/webview-spec.js b/spec/webview-spec.js
index 02207a4b26a4..39d10f15269c 100644
--- a/spec/webview-spec.js
+++ b/spec/webview-spec.js
@@ -171,7 +171,7 @@ describe('<webview> tag', function () {
   describe('preload attribute', function () {
     it('loads the script before other scripts in window', function (done) {
       var listener = function (e) {
-        assert.equal(e.message, 'function object object')
+        assert.equal(e.message, 'function object object function')
         webview.removeEventListener('console-message', listener)
         done()
       }
@@ -181,9 +181,9 @@ describe('<webview> tag', function () {
       document.body.appendChild(webview)
     })
 
-    it('preload script can still use "process" in required modules when nodeintegration is off', function (done) {
+    it('preload script can still use "process" and "Buffer" in required modules when nodeintegration is off', function (done) {
       webview.addEventListener('console-message', function (e) {
-        assert.equal(e.message, 'object undefined object')
+        assert.equal(e.message, 'object undefined object function')
         done()
       })
       webview.setAttribute('preload', fixtures + '/module/preload-node-off.js')
@@ -212,7 +212,7 @@ describe('<webview> tag', function () {
 
     it('works without script tag in page', function (done) {
       var listener = function (e) {
-        assert.equal(e.message, 'function object object')
+        assert.equal(e.message, 'function object object function')
         webview.removeEventListener('console-message', listener)
         done()
       }
@@ -224,7 +224,7 @@ describe('<webview> tag', function () {
 
     it('resolves relative URLs', function (done) {
       var listener = function (e) {
-        assert.equal(e.message, 'function object object')
+        assert.equal(e.message, 'function object object function')
         webview.removeEventListener('console-message', listener)
         done()
       }