diff --git a/etc/inc/functions.inc b/etc/inc/functions.inc
index 0db6ca2bcb..c97b7125c1 100644
--- a/etc/inc/functions.inc
+++ b/etc/inc/functions.inc
@@ -33,14 +33,14 @@
 
 /* include all configuration functions */
 require("captiveportal.inc");
-require("filter.inc");
-require("interfaces.inc");
-require("services.inc");
-require("system.inc");
-require("openvpn.inc");
-require("pfsense-utils.inc");
-require("util.inc");
-require("vpn.inc");
-require("vslb.inc");
+require_once("filter.inc");
+require_once("interfaces.inc");
+require_once("services.inc");
+require_once("system.inc");
+require_once("openvpn.inc");
+require_once("pfsense-utils.inc");
+require_once("util.inc");
+require_once("vpn.inc");
+require_once("vslb.inc");
 
 ?>
\ No newline at end of file