diff --git a/public/include/autoloader.inc.php b/public/include/autoloader.inc.php
index c2d605fe..1c8dba45 100644
--- a/public/include/autoloader.inc.php
+++ b/public/include/autoloader.inc.php
@@ -1,6 +1,9 @@
 <?php
-// SHA/Scrypt check
 
+// Make sure we are called from index.php
+if (!defined('SECURITY')) die('Hacking attempt');
+
+// SHA/Scrypt check
 if (empty($config['algorithm']) || $config['algorithm'] == 'scrypt') {
   $config['target_bits'] = 16;
 } else {
diff --git a/public/include/classes/memcached.class.php b/public/include/classes/memcached.class.php
index 824825c3..2f431337 100644
--- a/public/include/classes/memcached.class.php
+++ b/public/include/classes/memcached.class.php
@@ -1,5 +1,8 @@
 <?php
 
+// Make sure we are called from index.php
+if (!defined('SECURITY')) die('Hacking attempt');
+
 /**
  * A wrapper class which provides compatibility between Memcached and Memcache
  * PHP uses the Memcached class on *nix environments, and the Memcache class
@@ -12,4 +15,4 @@ class Memcached
   {
     return parent::set($key, $value, 0, $expiration);
   }
-} 
\ No newline at end of file
+} 
diff --git a/public/include/config/memcache_keys.inc.php b/public/include/config/memcache_keys.inc.php
index 61538ebd..f689a868 100644
--- a/public/include/config/memcache_keys.inc.php
+++ b/public/include/config/memcache_keys.inc.php
@@ -1,5 +1,8 @@
 <?php
 
+// Make sure we are called from index.php
+if (!defined('SECURITY')) die('Hacking attempt');
+
 define('STATISTICS_ALL_USER_SHARES', 'STATISTICS_ALL_USER_SHARES');
 define('STATISTICS_ROUND_SHARES', 'STATISTICS_ROUND_SHARES');
 ?>
diff --git a/public/include/version.inc.php b/public/include/version.inc.php
index 77d41b4d..a06b9bf8 100644
--- a/public/include/version.inc.php
+++ b/public/include/version.inc.php
@@ -1,5 +1,8 @@
 <?php
 
+// Make sure we are called from index.php
+if (!defined('SECURITY')) die('Hacking attempt');
+
 define('DB_VERSION', '0.0.2');
 define('CONFIG_VERSION', '0.0.2');
 define('MPOS_VERSION', '0.0.1');