diff --git a/_layouts/default.html b/_layouts/default.html
index 06662ee1c29b30e819f6786974b0d15ae2268b14..2d5fe6ba17de842fe5ebaa64bb05aacd207deb39 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -1,6 +1,6 @@
<!DOCTYPE html>
-<html lang="en-us">
+<html lang="{{ site.lang | default: "en-US" }}">
{% include head.html %}
<body>