diff --git a/opentech/templates/base.html b/opentech/templates/base.html
index 2f97f0be28d36284e29e51b154490b76e8011956..97cbd38e5d737ae724d722564183c01cd244933f 100644
--- a/opentech/templates/base.html
+++ b/opentech/templates/base.html
@@ -1,5 +1,5 @@
{% load static wagtailuserbar wagtailcore_tags wagtailimages_tags navigation_tags util_tags %}<!doctype html>
-<html class="no-js" lang="">
+<html class="no-js" lang="en">
<head>
{# TODO fallbacks if page is not defined e.g. for 404 page #}
<meta charset="utf-8" />