diff --git a/scripts/froxlor_master_cronjob.php b/scripts/froxlor_master_cronjob.php
index 610d4dc7..c71a324d 100644
--- a/scripts/froxlor_master_cronjob.php
+++ b/scripts/froxlor_master_cronjob.php
@@ -15,6 +15,8 @@
  *
  */
 
+define('MASTER_CRONJOB', 1);
+
 include_once(dirname(__FILE__) . '/../lib/cron_init.php');
 
 $jobs_to_run = includeCronjobs($debugHandler, $pathtophpfiles);
diff --git a/scripts/jobs/cron_apsinstaller.php b/scripts/jobs/cron_apsinstaller.php
index 6f872619..d52e5dfc 100644
--- a/scripts/jobs/cron_apsinstaller.php
+++ b/scripts/jobs/cron_apsinstaller.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_apsupdater.php b/scripts/jobs/cron_apsupdater.php
index 722cf1f1..ffc5ed73 100644
--- a/scripts/jobs/cron_apsupdater.php
+++ b/scripts/jobs/cron_apsupdater.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_autoresponder.php b/scripts/jobs/cron_autoresponder.php
index 5070cdab..ab648791 100644
--- a/scripts/jobs/cron_autoresponder.php
+++ b/scripts/jobs/cron_autoresponder.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_backup.php b/scripts/jobs/cron_backup.php
index 9b54e052..fa58db07 100644
--- a/scripts/jobs/cron_backup.php
+++ b/scripts/jobs/cron_backup.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_lighttp.htaccess.php b/scripts/jobs/cron_lighttp.htaccess.php
index 72170d28..eecfcc19 100644
--- a/scripts/jobs/cron_lighttp.htaccess.php
+++ b/scripts/jobs/cron_lighttp.htaccess.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_mailboxsize.php b/scripts/jobs/cron_mailboxsize.php
index dcd8bfc7..c3ffc963 100644
--- a/scripts/jobs/cron_mailboxsize.php
+++ b/scripts/jobs/cron_mailboxsize.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.dns.10.bind.php b/scripts/jobs/cron_tasks.inc.dns.10.bind.php
index 306f3ea2..c9e3d312 100644
--- a/scripts/jobs/cron_tasks.inc.dns.10.bind.php
+++ b/scripts/jobs/cron_tasks.inc.dns.10.bind.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.10.apache.php b/scripts/jobs/cron_tasks.inc.http.10.apache.php
index 8916c2ee..8f36388d 100644
--- a/scripts/jobs/cron_tasks.inc.http.10.apache.php
+++ b/scripts/jobs/cron_tasks.inc.http.10.apache.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.15.apache_fcgid.php b/scripts/jobs/cron_tasks.inc.http.15.apache_fcgid.php
index fc2a60b8..8caa27c5 100644
--- a/scripts/jobs/cron_tasks.inc.http.15.apache_fcgid.php
+++ b/scripts/jobs/cron_tasks.inc.http.15.apache_fcgid.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.20.lighttpd.php b/scripts/jobs/cron_tasks.inc.http.20.lighttpd.php
index d5b07c30..ed9544bc 100644
--- a/scripts/jobs/cron_tasks.inc.http.20.lighttpd.php
+++ b/scripts/jobs/cron_tasks.inc.http.20.lighttpd.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.25.lighttpd_fcgid.php b/scripts/jobs/cron_tasks.inc.http.25.lighttpd_fcgid.php
index 10bc65ff..160d4ef7 100644
--- a/scripts/jobs/cron_tasks.inc.http.25.lighttpd_fcgid.php
+++ b/scripts/jobs/cron_tasks.inc.http.25.lighttpd_fcgid.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.30.nginx.php b/scripts/jobs/cron_tasks.inc.http.30.nginx.php
index 49776e66..1fe93709 100644
--- a/scripts/jobs/cron_tasks.inc.http.30.nginx.php
+++ b/scripts/jobs/cron_tasks.inc.http.30.nginx.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.inc.http.35.nginx_phpfpm.php b/scripts/jobs/cron_tasks.inc.http.35.nginx_phpfpm.php
index f15a75fe..391c7b10 100644
--- a/scripts/jobs/cron_tasks.inc.http.35.nginx_phpfpm.php
+++ b/scripts/jobs/cron_tasks.inc.http.35.nginx_phpfpm.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_tasks.php b/scripts/jobs/cron_tasks.php
index e65d837f..e69cc329 100644
--- a/scripts/jobs/cron_tasks.php
+++ b/scripts/jobs/cron_tasks.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_ticketarchive.php b/scripts/jobs/cron_ticketarchive.php
index fb81d04b..a85b4f0c 100644
--- a/scripts/jobs/cron_ticketarchive.php
+++ b/scripts/jobs/cron_ticketarchive.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_traffic.php b/scripts/jobs/cron_traffic.php
index 5b075e4c..b93aa66a 100644
--- a/scripts/jobs/cron_traffic.php
+++ b/scripts/jobs/cron_traffic.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_usage.inc.diskspace.php b/scripts/jobs/cron_usage.inc.diskspace.php
index 2c3db743..3ed11638 100644
--- a/scripts/jobs/cron_usage.inc.diskspace.php
+++ b/scripts/jobs/cron_usage.inc.diskspace.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_usage_report.php b/scripts/jobs/cron_usage_report.php
index a4c13d23..41952c77 100644
--- a/scripts/jobs/cron_usage_report.php
+++ b/scripts/jobs/cron_usage_report.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.
diff --git a/scripts/jobs/cron_used_tickets_reset.php b/scripts/jobs/cron_used_tickets_reset.php
index 693dba0c..c4470cd6 100644
--- a/scripts/jobs/cron_used_tickets_reset.php
+++ b/scripts/jobs/cron_used_tickets_reset.php
@@ -1,4 +1,4 @@
-<?php
+<?php if (!defined('MASTER_CRONJOB')) die('You cannot access this file directly!');
 
 /**
  * This file is part of the Froxlor project.