diff --git a/security/stunnel/src/opnsense/scripts/stunnel/generate_certs.php b/security/stunnel/src/opnsense/scripts/stunnel/generate_certs.php
index 4aeb667e4..da6962980 100755
--- a/security/stunnel/src/opnsense/scripts/stunnel/generate_certs.php
+++ b/security/stunnel/src/opnsense/scripts/stunnel/generate_certs.php
@@ -27,6 +27,7 @@
  *    POSSIBILITY OF SUCH DAMAGE.
  */
 
+require_once('util.inc');
 require_once('plugins.inc');
 require_once('config.inc');
 require_once('certs.inc');