diff --git a/vpn_service.h b/vpn_service.h
index 2b45b61..6466a57 100644
--- a/vpn_service.h
+++ b/vpn_service.h
@@ -30,6 +30,7 @@
   virtual std::string GetStorageIdentifier() const;
   virtual bool Load(StoreInterface *storage);
   virtual bool Save(StoreInterface *storage);
+  virtual bool Unload();
 
   virtual void InitDriverPropertyStore();