diff --git a/OpenVPN Adapter/OpenVPNClient.h b/OpenVPN Adapter/OpenVPNClient.h
index 91f2fe8..fcd2c64 100644
--- a/OpenVPN Adapter/OpenVPNClient.h	
+++ b/OpenVPN Adapter/OpenVPNClient.h	
@@ -15,6 +15,8 @@ class OpenVPNClient : public ClientAPI::OpenVPNClient
 public:
     OpenVPNClient(void * adapter);
     
+    virtual TunClientFactory* new_tun_factory(const ExternalTun::Config& conf, const OptionList& opt) override;
+    
     virtual bool tun_builder_new() override;
     
     virtual bool tun_builder_set_remote_address(const std::string& address, bool ipv6) override;
diff --git a/OpenVPN Adapter/OpenVPNClient.mm b/OpenVPN Adapter/OpenVPNClient.mm
index 47a3aa6..da45138 100644
--- a/OpenVPN Adapter/OpenVPNClient.mm	
+++ b/OpenVPN Adapter/OpenVPNClient.mm	
@@ -17,6 +17,10 @@ OpenVPNClient::OpenVPNClient(void *adapter) : ClientAPI::OpenVPNClient() {
     this->adapter = adapter;
 }
 
+TunClientFactory* OpenVPNClient::new_tun_factory(const ExternalTun::Config& conf, const OptionList& opt) {
+    return nullptr;
+}
+
 bool OpenVPNClient::tun_builder_new() {
     return [(__bridge OpenVPNAdapter *)adapter configureSockets];
 }