diff --git a/src/www/firewall_nat_out_edit.php b/src/www/firewall_nat_out_edit.php
index 6293d2bb0..317051adf 100644
--- a/src/www/firewall_nat_out_edit.php
+++ b/src/www/firewall_nat_out_edit.php
@@ -488,8 +488,9 @@ function poolopts_change() {
 														$interfaces["enc0"] = "IPsec";
 
 												/* add openvpn/tun interfaces */
-												if  ($config['openvpn']["openvpn-server"] || $config['openvpn']["openvpn-client"])
-													$interfaces["openvpn"] = "OpenVPN";
+												if (isset($config['openvpn']['openvpn-server']) || isset($config['openvpn']['openvpn-client'])) {
+													$interfaces['openvpn'] = 'OpenVPN';
+												}
 
 												foreach ($interfaces as $iface => $ifacename):
 							?>