diff --git a/lib/javascript.php b/lib/javascript.php
index 1c37c88cfc3..f22d1d2c982 100644
--- a/lib/javascript.php
+++ b/lib/javascript.php
@@ -1,3 +1,5 @@
+<?php defined('MOODLE_INTERNAL') or die('Direct access to this script is forbidden.'); ?>
+
 <script language="JavaScript" type="text/javascript"
 
         src="<?php echo "$CFG->wwwroot/lib/overlib.js" ?>"></script>
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index d56a09e6230..b526bd09306 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -37,6 +37,12 @@
  */
 /// CONSTANTS /////////////////////////////////////////////////////////////
 
+/**
+ * Used by some scripts to check they are being called by Moodle
+ */
+define('MOODLE_INTERNAL', true);
+
+
 /**
  * No groups used?
  */