diff --git a/DummyLoader/Image3dSource.hpp b/DummyLoader/Image3dSource.hpp
index cef8758..f479e93 100644
--- a/DummyLoader/Image3dSource.hpp
+++ b/DummyLoader/Image3dSource.hpp
@@ -32,6 +32,10 @@ class ATL_NO_VTABLE Image3dSource :
 
     HRESULT STDMETHODCALLTYPE GetSopInstanceUID(/*out*/BSTR *uid_str) override;
 
+    HRESULT STDMETHODCALLTYPE GetPresentationState(IPresentationState *) override {
+        return E_NOTIMPL;
+    }
+
     Image3d SampleFrame (const Image3d & frame, Cart3dGeom out_geom, unsigned short max_res[3]);
 
     DECLARE_REGISTRY_RESOURCEID(IDR_Image3dSource)