diff --git a/Core/Code/Testing/mitkRenderingTestHelper.h b/Core/Code/Testing/mitkRenderingTestHelper.h
index 8cd4156b93..93840a4fab 100644
--- a/Core/Code/Testing/mitkRenderingTestHelper.h
+++ b/Core/Code/Testing/mitkRenderingTestHelper.h
@@ -1,51 +1,51 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Language:  C++
 Date:      $Date: 2010-03-31 17:34:48 +0200 (Wed, 31 Mar 2010) $
 Version:   $Revision: 21985 $
 
 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 mitkRenderingTestHelper_h
 #define mitkRenderingTestHelper_h
 
 #include <string>
 #include <vtkSmartPointer.h>
 #include <vtkRenderWindow.h>
 #include <mitkRenderWindow.h>
 
 class vtkRenderWindow;
 class vtkRenderer;
 
 namespace mitk
 {
   class DataStorage;
 }
 
-class mitkRenderingTestHelper
+class MITK_CORE_EXPORT mitkRenderingTestHelper
 {
   public:
     mitkRenderingTestHelper(int width, int height, mitk::DataStorage* ds);
 
     ~mitkRenderingTestHelper();
 
     vtkRenderer* GetVtkRenderer();
     vtkRenderWindow* GetVtkRenderWindow();
     void SaveAsPNG(std::string fileName);
 
   protected:
     mitk::RenderWindow::Pointer m_RenderWindow;
 
 };
 
 #endif