diff --git a/packages/@vue/cli-service-global/template/index.html b/packages/@vue/cli-service-global/template/index.html
index be3c262d87..6d5ffe963d 100644
--- a/packages/@vue/cli-service-global/template/index.html
+++ b/packages/@vue/cli-service-global/template/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="">
   <head>
     <meta charset="utf-8">
     <title>Vue CLI App</title>
diff --git a/packages/@vue/cli-service/generator/template/public/index.html b/packages/@vue/cli-service/generator/template/public/index.html
index 3d4e96efc2..2a4672c1f7 100644
--- a/packages/@vue/cli-service/generator/template/public/index.html
+++ b/packages/@vue/cli-service/generator/template/public/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="">
   <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
diff --git a/packages/@vue/cli-service/lib/config/index-default.html b/packages/@vue/cli-service/lib/config/index-default.html
index 73453d6011..53faecd1b0 100644
--- a/packages/@vue/cli-service/lib/config/index-default.html
+++ b/packages/@vue/cli-service/lib/config/index-default.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="">
   <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
