diff --git a/awx/api/templates/api/stdout.html b/awx/api/templates/api/stdout.html
index 3e323f0ed3..658781803e 100644
--- a/awx/api/templates/api/stdout.html
+++ b/awx/api/templates/api/stdout.html
@@ -1,6 +1,6 @@
 {% if content_only %}<div class="nocode ansi_fore ansi_back{% if dark %} ansi_dark{% endif %}">{% else %}
 <!DOCTYPE HTML>
-<html>
+<html lang="en">
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>{{ title }}</title>
