diff --git a/Modules/Applications/AppClassification/app/otbTrainImagesClassifier.cxx b/Modules/Applications/AppClassification/app/otbTrainImagesClassifier.cxx
index 5a5512b35a7fc52465a840557e1b786374ca0b15..dafe23e9575191af91235c5de78c6aeca3936ee4 100644
--- a/Modules/Applications/AppClassification/app/otbTrainImagesClassifier.cxx
+++ b/Modules/Applications/AppClassification/app/otbTrainImagesClassifier.cxx
@@ -106,7 +106,7 @@ public:
    */
   void ExtractValidationData(FloatVectorImageListType *imageList, TrainFileNamesHandler& fileNames,
                              std::vector<std::string> validationVectorFileList,
-                             const SamplingRates& rates, bool HasInputVector )
+                             const SamplingRates& rates, bool itkNotUsed(HasInputVector) )
   {
     if( !validationVectorFileList.empty() ) // Compute class statistics and sampling rate of validation data if provided.
       {