diff --git a/usr/local/www/interfaces_assign.php b/usr/local/www/interfaces_assign.php
index 9b540f4427..9e12b6870f 100755
--- a/usr/local/www/interfaces_assign.php
+++ b/usr/local/www/interfaces_assign.php
@@ -47,6 +47,7 @@ require("filter.inc");
 require("shaper.inc");
 require("ipsec.inc");
 require("vpn.inc");
+require("captiveportal.inc");
 
 /*
 	In this file, "port" refers to the physical port name,