diff --git a/extras/vcl-ldpreload/test/common/nginx_welcome.html b/extras/vcl-ldpreload/test/common/nginx_welcome.html
index 2ca3b9543c0..c3850904482 100644
--- a/extras/vcl-ldpreload/test/common/nginx_welcome.html
+++ b/extras/vcl-ldpreload/test/common/nginx_welcome.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en" xml:lang="en">
 <head>
 <title>Welcome to nginx!</title>
 <style>
