--- a/Core/Images/PngWriter.h	Thu Jun 28 12:24:45 2018 +0200
+++ b/Core/Images/PngWriter.h	Thu Jul 05 12:25:00 2018 +0200
@@ -50,21 +50,21 @@
   class PngWriter : public IImageWriter
   {
   protected:
+#if ORTHANC_SANDBOXED == 0
     virtual void WriteToFileInternal(const std::string& filename,
                                      unsigned int width,
                                      unsigned int height,
                                      unsigned int pitch,
                                      PixelFormat format,
                                      const void* buffer);
+#endif
 
-#if ORTHANC_SANDBOXED == 0
     virtual void WriteToMemoryInternal(std::string& png,
                                        unsigned int width,
                                        unsigned int height,
                                        unsigned int pitch,
                                        PixelFormat format,
                                        const void* buffer);
-#endif
 
   private:
     struct PImpl;