diff --git a/src/etc/inc/system.inc b/src/etc/inc/system.inc
index a5bca3b9c..3df7011df 100644
--- a/src/etc/inc/system.inc
+++ b/src/etc/inc/system.inc
@@ -567,7 +567,7 @@ function system_interface_route($gw, $routes)
 
     if (!$far) {
         /* special case tries to turn on far gateway when required for dynamic gateway */
-        $dynamicgw = trim(@file_get_contents("/tmp/{$device}_router") ?? '');
+        $dynamicgw = OPNsense\Interface\Autoconf::getRouter($device, 'inet');
         if (!empty($dynamicgw) && $gateway === $dynamicgw) {
             list (, $network) = interfaces_primary_address($interface);
             if (!empty($network) && !ip_in_subnet($gateway, $network)) {
diff --git a/src/etc/rc.newwanip b/src/etc/rc.newwanip
index aa60bdbf3..812664c1c 100755
--- a/src/etc/rc.newwanip
+++ b/src/etc/rc.newwanip
@@ -66,7 +66,7 @@ if (!is_ipaddr($ip)) {
     return;
 }
 
-$gw = trim(@file_get_contents("/tmp/{$device}_router") ?? '');
+$gw = OPNsense\Interface\Autoconf::getRouter($device, 'inet');
 
 $cacheip_file = "/tmp/{$device}_oldip";
 $cacheip = trim(@file_get_contents($cacheip_file));