diff --git a/miniwin/src/internal/d3drmviewport_impl.h b/miniwin/src/internal/d3drmviewport_impl.h
index d4d99a6b..98d66643 100644
--- a/miniwin/src/internal/d3drmviewport_impl.h
+++ b/miniwin/src/internal/d3drmviewport_impl.h
@@ -21,7 +21,7 @@ class Direct3DRMFrameImpl;
 
 struct Direct3DRMViewportImpl : public Direct3DRMObjectBaseImpl<IDirect3DRMViewport> {
 	Direct3DRMViewportImpl(DWORD width, DWORD height, Direct3DRMRenderer* renderer);
-	~Direct3DRMViewportImpl();
+	~Direct3DRMViewportImpl() override;
 	HRESULT Render(IDirect3DRMFrame* group) override;
 	/**
 	 * @brief Blit the render back to our backbuffer