diff --git a/src/www/services_upnp.php b/src/www/services_upnp.php
index d7bd7cd35..bd0a019ee 100644
--- a/src/www/services_upnp.php
+++ b/src/www/services_upnp.php
@@ -30,6 +30,7 @@
 require_once("guiconfig.inc");
 require_once("interfaces.inc");
 require_once("services.inc");
+require_once("filter.inc");
 require_once("system.inc");
 require_once("plugins.inc.d/miniupnpd.inc");