diff --git a/src/www/services_dnsmasq_domainoverride_edit.php b/src/www/services_dnsmasq_domainoverride_edit.php
index ce3879050..7091641f5 100644
--- a/src/www/services_dnsmasq_domainoverride_edit.php
+++ b/src/www/services_dnsmasq_domainoverride_edit.php
@@ -27,6 +27,7 @@
 */
 
 require_once("guiconfig.inc");
+require_once("system.inc");
 require_once("services.inc");
 require_once("interfaces.inc");
 require_once("pfsense-utils.inc");