diff --git a/DummyLoader/Image3dSource.hpp b/DummyLoader/Image3dSource.hpp
index 27d56e4..4e4e967 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;
+    }
+
     DECLARE_REGISTRY_RESOURCEID(IDR_Image3dSource)
 
     BEGIN_COM_MAP(Image3dSource)