diff --git a/route/assetproxy.php b/route/assetproxy.php
index c4cda58..85e3a8f 100644
--- a/route/assetproxy.php
+++ b/route/assetproxy.php
@@ -1,4 +1,6 @@
 <?php
+if(!defined("_DEF_RSF_")) set_error_exit("do not allow access");
+
 loadHelper("webpagetool");
 
 $path = str_replace("../", "", get_requested_value("path"));