diff --git a/Modules/Classification/CLUtilities/include/mitkCLResultWritter.h b/Modules/Classification/CLUtilities/include/mitkCLResultWritter.h
index 3b52fae14f..77147c30e3 100644
--- a/Modules/Classification/CLUtilities/include/mitkCLResultWritter.h
+++ b/Modules/Classification/CLUtilities/include/mitkCLResultWritter.h
@@ -1,39 +1,39 @@
 #ifndef mitkCLResultWritter_h
 #define mitkCLResultWritter_h
 
 #include "MitkCLUtilitiesExports.h"
 
 #include <sstream>
 #include <fstream>
 #include <vector>
 
 #include <mitkAbstractGlobalImageFeature.h>
 
 namespace mitk
 {
   namespace cl
   {
     class MITKCLUTILITIES_EXPORT FeatureResultWritter
     {
     public:
       FeatureResultWritter(std::string, int mode);
       ~FeatureResultWritter();
 
       void AddColumn(std::string value);
       void AddColumn(double value);
       void NewRow(std::string endName);
 
       void AddResult(std::string desc, int slice, mitk::AbstractGlobalImageFeature::FeatureListType stats, bool withHeader);
 
     private:
       int m_Mode;
-      int m_CurrentRow;
+      std::size_t m_CurrentRow;
       int m_CurrentElement;
       std::string m_Separator;
       std::ofstream m_Output;
       std::vector<std::string> m_List;
     };
   }
 }
 
 #endif //mitkCLResultWritter_h
\ No newline at end of file