diff --git a/Modules/ToFHardware/mitkToFNrrdImageWriter.h b/Modules/ToFHardware/mitkToFNrrdImageWriter.h
index 49db648aed..0bd7411770 100644
--- a/Modules/ToFHardware/mitkToFNrrdImageWriter.h
+++ b/Modules/ToFHardware/mitkToFNrrdImageWriter.h
@@ -1,79 +1,81 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Module:    $RCSfile$
 Language:  C++
 Date:      $Date: 2010-05-27 16:06:53 +0200 (Do, 27 Mai 2010) $
 Version:   $Revision:  $
 
 Copyright (c) German Cancer Research Center, Division of Medical and
 Biological Informatics. All rights reserved.
 See MITKCopyright.txt or http://www.mitk.org/copyright.html for details.
 
 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notices for more information.
 
 =========================================================================*/
 #ifndef __mitkToFNrrdImageWriter_h
 #define __mitkToFNrrdImageWriter_h
 
 #include "mitkToFHardwareExports.h"
 #include "mitkToFImageWriter.h"
 
+#include <fstream>
+
 namespace mitk
 {
   /**
   * @brief Writer class for ToF nrrd images
   * 
   * This writer class allows streaming of ToF data into a nrrd file. This class uses the itkNrrdImageIO class
   * Writer can simultaneously save "distance", "intensity" and "amplitude" image.
   * Images can be written as 3D volume (ToFImageType::ToFImageType3D) or temporal image stack (ToFImageType::ToFImageType2DPlusT)
   *
   * @ingroup ToFHardware
   */
   class MITK_TOFHARDWARE_EXPORT ToFNrrdImageWriter : public ToFImageWriter
   {
   public: 
     mitkClassMacro( ToFNrrdImageWriter , ToFImageWriter );
     itkNewMacro( Self );
 
     /*!
     \brief Open file(s) for writing
     */
     void Open();
     /*!
     \brief Close file(s) add .pic header and write
     */
     void Close();
     /*!
     \brief Add new data to file.
     */
     void Add(float* distanceFloatData, float* amplitudeFloatData, float* intensityFloatData);
 
   protected:
 
     std::ofstream m_DistanceOutfile; ///< file for distance image
     std::ofstream m_AmplitudeOutfile; ///< file for amplitude image
     std::ofstream m_IntensityOutfile; ///< file for intensity image
 
   private:
 
     ToFNrrdImageWriter();
     ~ToFNrrdImageWriter();
 
     /*!
     \brief Open file by filename to gain write access to it.
     */
     void OpenStreamFile(std::ofstream &outfile, std::string outfileName);
     /*!
     \brief Close file after work on it is finished.
     */
     void CloseStreamFile(std::ofstream &outfile, std::string fileName);
     /*!
     \brief Write image information to the NrrdFile.
     */
     void ConvertStreamToNrrdFormat( std::string fileName );
   };
 } //END mitk namespace
 #endif // __mitkToFNrrdImageWriter_h