diff --git a/etc/rc.filter_configure_sync b/etc/rc.filter_configure_sync
index 8597e62ff5..f30ee15240 100755
--- a/etc/rc.filter_configure_sync
+++ b/etc/rc.filter_configure_sync
@@ -31,6 +31,9 @@
 
 require_once("config.inc");
 require_once("functions.inc");
+require_once("functions.inc");
+require_once("ipsec.inc");
+require_once("vpn.inc");
 
 /* invalidate interface cache */
 get_interface_arr(true);