diff --git a/lib/builder/webpack/client.config.js b/lib/builder/webpack/client.config.js
index eb93137b0a..cd3ff13e43 100644
--- a/lib/builder/webpack/client.config.js
+++ b/lib/builder/webpack/client.config.js
@@ -137,10 +137,6 @@ module.exports = function webpackClientConfig() {
   if (typeof this.options.build.extend === 'function') {
     const isDev = this.options.dev
     const extendedConfig = this.options.build.extend.call(this, config, {
-      get dev() {
-        printWarn('dev has been deprecated in build.extend(), please use isDev')
-        return isDev
-      },
       isDev,
       isClient: true
     })
diff --git a/lib/builder/webpack/server.config.js b/lib/builder/webpack/server.config.js
index 064423742c..382b0cd76e 100644
--- a/lib/builder/webpack/server.config.js
+++ b/lib/builder/webpack/server.config.js
@@ -75,10 +75,6 @@ module.exports = function webpackServerConfig() {
   if (typeof this.options.build.extend === 'function') {
     const isDev = this.options.dev
     const extendedConfig = this.options.build.extend.call(this, config, {
-      get dev() {
-        printWarn('dev has been deprecated in build.extend(), please use isDev')
-        return isDev
-      },
       isDev,
       isServer: true
     })
diff --git a/test/deprecate.test.js b/test/deprecate.test.js
index 92187220a6..eff3bd4b29 100644
--- a/test/deprecate.test.js
+++ b/test/deprecate.test.js
@@ -27,14 +27,6 @@ test.serial('Init Nuxt.js', async t => {
   t.true(buildSpies.log.calledWithMatch('OPEN'))
 })
 
-test.serial('Deprecated: dev in build.extend()', async t => {
-  t.true(
-    buildSpies.warn.calledWithMatch(
-      'dev has been deprecated in build.extend(), please use isDev'
-    )
-  )
-})
-
 test.serial('Deprecated: nuxt.plugin()', async t => {
   t.true(nuxt.__builder_plugin)
 })
diff --git a/test/fixtures/deprecate/nuxt.config.js b/test/fixtures/deprecate/nuxt.config.js
index f53f162aea..6415102f2f 100644
--- a/test/fixtures/deprecate/nuxt.config.js
+++ b/test/fixtures/deprecate/nuxt.config.js
@@ -1,11 +1,6 @@
 module.exports = {
   modules: ['~/modules/deprecated-apis'],
   build: {
-    stats: false,
-    extend(config, options) {
-      if (options.dev) {
-        // Please use isDev instead of dev
-      }
-    }
+    stats: false
   }
 }