diff --git a/www/web-proxy-sso/src/opnsense/scripts/OPNsense/SSOProxyAD/updateDomain.php b/www/web-proxy-sso/src/opnsense/scripts/OPNsense/SSOProxyAD/updateDomain.php
index 62fc74519..3cb2321d0 100755
--- a/www/web-proxy-sso/src/opnsense/scripts/OPNsense/SSOProxyAD/updateDomain.php
+++ b/www/web-proxy-sso/src/opnsense/scripts/OPNsense/SSOProxyAD/updateDomain.php
@@ -31,6 +31,7 @@
 require_once("config.inc");
 require_once("certs.inc");
 require_once("legacy_bindings.inc");
+require_once("util.inc");
 
 use OPNsense\Core\Config;