diff --git a/Modules/DiffusionImaging/FiberTracking/Algorithms/GibbsTracking/mitkParticle.h b/Modules/DiffusionImaging/FiberTracking/Algorithms/GibbsTracking/mitkParticle.h
index 141c38b20a..a2e41268ef 100644
--- a/Modules/DiffusionImaging/FiberTracking/Algorithms/GibbsTracking/mitkParticle.h
+++ b/Modules/DiffusionImaging/FiberTracking/Algorithms/GibbsTracking/mitkParticle.h
@@ -1,76 +1,80 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #ifndef _PARTICLE
 #define _PARTICLE
 
 #include <FiberTrackingExports.h>
 #include <vnl/vnl_vector_fixed.h>
 
+
 namespace mitk
 {
 
 /**
 * \brief A particle is the basic element of the Gibbs fiber tractography method.   */
 
 class FiberTracking_EXPORT Particle
 {
 public:
 
     Particle()
     {
         label = 0;
         pID = -1;
         mID = -1;
     }
 
     ~Particle()
     {
     }
 
+#pragma warning(push)
+#pragma warning(disable: 4251)
     vnl_vector_fixed<float, 3> pos; // particle position (world coordinates. corner based voxels. not accounted for image rotation.
     vnl_vector_fixed<float, 3> dir; // normalized direction vector
+#pragma warning(pop)
 
     int gridindex;          // index in the grid where it is living
     int ID;                 // particle ID
     int pID;                // successor ID
     int mID;                // predecessor ID
     unsigned char label;    // label used in the fiber building process
 };
 
 class FiberTracking_EXPORT EndPoint
 {
 public:
     EndPoint()
     {}
 
     EndPoint(Particle *p,int ep)
     {
         this->p = p;
         this->ep = ep;
     }
     Particle *p;
     int ep;
 
     inline bool operator==(EndPoint P)
     {
         return (P.p == p) && (P.ep == ep);
     }
 };
 
 }
 
 #endif