diff --git a/lib/demo/demo.hpp b/lib/demo/demo.hpp
index a3b814112..def3754d2 100644
--- a/lib/demo/demo.hpp
+++ b/lib/demo/demo.hpp
@@ -36,7 +36,7 @@ public:
 	DECLARE_OBJECT(Demo);
 	DECLARE_OBJECTNAME(Demo);
 
-	virtual void Start(bool runtimeCreated);
+	virtual void Start(bool runtimeCreated) override;
 
 	static Value DemoMessageHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params);