diff --git a/monitor.go b/monitor.go
index 0fe6396..910570a 100644
--- a/monitor.go
+++ b/monitor.go
@@ -39,5 +39,6 @@ type DefaultInterfaceMonitor interface {
 }
 
 type DefaultInterfaceMonitorOptions struct {
-	OverrideAndroidVPN bool
+	OverrideAndroidVPN    bool
+	UnderNetworkExtension bool
 }
diff --git a/monitor_darwin.go b/monitor_darwin.go
index 296ba54..1df1f21 100644
--- a/monitor_darwin.go
+++ b/monitor_darwin.go
@@ -122,11 +122,16 @@ func (m *defaultInterfaceMonitor) checkUpdate() error {
 		break
 	}
 	if defaultInterface == nil {
-		defaultInterface, err = getDefaultInterfaceBySocket()
-		if err != nil {
-			return err
+		if m.options.UnderNetworkExtension {
+			defaultInterface, err = getDefaultInterfaceBySocket()
+			if err != nil {
+				return err
+			}
 		}
 	}
+	if defaultInterface == nil {
+		return ErrNoRoute
+	}
 	oldInterface := m.defaultInterfaceName
 	oldIndex := m.defaultInterfaceIndex
 	m.defaultInterfaceIndex = defaultInterface.Index