diff --git a/Examples/RegistrationITKv4/ImageRegistrationHistogramPlotter.cxx b/Examples/RegistrationITKv4/ImageRegistrationHistogramPlotter.cxx
index 9126f03f704..053b2618177 100644
--- a/Examples/RegistrationITKv4/ImageRegistrationHistogramPlotter.cxx
+++ b/Examples/RegistrationITKv4/ImageRegistrationHistogramPlotter.cxx
@@ -377,7 +377,6 @@ class HistogramWriter
   HistogramToImageFilterPointer m_Filter;
   HistogramFileWriterPointer    m_HistogramFileWriter;
   // Software Guide : EndCodeSnippet
-  std::string m_OutputFile;
 };
 
 // Command - observer invoked after every iteration of the optimizer