--- a/OrthancStone/Sources/Volumes/IVolumeSlicer.h	Mon Sep 21 14:50:26 2020 +0200
+++ b/OrthancStone/Sources/Volumes/IVolumeSlicer.h	Mon Sep 21 17:46:39 2020 +0200
@@ -78,15 +78,15 @@
     class InvalidSlice : public IExtractedSlice
     {
     public:
-      virtual bool IsValid()
+      virtual bool IsValid() ORTHANC_OVERRIDE
       {
         return false;
       }
 
-      virtual uint64_t GetRevision();
+      virtual uint64_t GetRevision() ORTHANC_OVERRIDE;
 
       virtual ISceneLayer* CreateSceneLayer(const ILayerStyleConfigurator* configurator,
-                                            const CoordinateSystem3D& cuttingPlane);
+                                            const CoordinateSystem3D& cuttingPlane) ORTHANC_OVERRIDE;
     };