diff --git a/app/angular/src/server/index.html.ejs b/app/angular/src/server/index.html.ejs
index 397aaf41d52e..dfcb56218d36 100644
--- a/app/angular/src/server/index.html.ejs
+++ b/app/angular/src/server/index.html.ejs
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
diff --git a/app/polymer/src/server/index.html.ejs b/app/polymer/src/server/index.html.ejs
index 397aaf41d52e..dfcb56218d36 100644
--- a/app/polymer/src/server/index.html.ejs
+++ b/app/polymer/src/server/index.html.ejs
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
diff --git a/app/react-native/src/server/index.html.ejs b/app/react-native/src/server/index.html.ejs
index 84b46693e476..b383519cb3d7 100644
--- a/app/react-native/src/server/index.html.ejs
+++ b/app/react-native/src/server/index.html.ejs
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
 <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
diff --git a/app/react/src/server/index.html.ejs b/app/react/src/server/index.html.ejs
index 397aaf41d52e..dfcb56218d36 100644
--- a/app/react/src/server/index.html.ejs
+++ b/app/react/src/server/index.html.ejs
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
diff --git a/app/vue/src/server/index.html.ejs b/app/vue/src/server/index.html.ejs
index 397aaf41d52e..dfcb56218d36 100644
--- a/app/vue/src/server/index.html.ejs
+++ b/app/vue/src/server/index.html.ejs
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
