diff --git a/src/content/themes/default/index.php b/src/content/themes/default/index.php
index 1692f18..a519872 100644
--- a/src/content/themes/default/index.php
+++ b/src/content/themes/default/index.php
@@ -1,4 +1,7 @@
-<?php header("Content-type: text/html; charset=utf-8"); ?>
+<?php
+	if (!defined('MTTPATH')) die("Unexpected usage.");
+	header("Content-type: text/html; charset=utf-8");
+?>
 <!doctype html>
 <html>
 <head>
