diff --git a/Modules/QtWidgetsExt/QmitkSelectableGLWidget.h b/Modules/QtWidgetsExt/QmitkSelectableGLWidget.h
index d1cc1f8826..35e8a9059a 100644
--- a/Modules/QtWidgetsExt/QmitkSelectableGLWidget.h
+++ b/Modules/QtWidgetsExt/QmitkSelectableGLWidget.h
@@ -1,48 +1,49 @@
 /*===================================================================
 
 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 QMITKSELECTABLEGLWIDGET_H
 #define QMITKSELECTABLEGLWIDGET_H
 
 #include "ui_QmitkSelectableGLWidget.h"
 #include "mitkCameraRotationController.h"
 #include "mitkCommon.h"
 #include "mitkSliceNavigationController.h"
 #include "mitkVtkPropRenderer.h"
+#include <MitkQtWidgetsExtExports.h>
 
 #include <mitkCommon.h>
 
 #include <QWidget>
 
 class QmitkRenderWindow;
 
-class QmitkSelectableGLWidget : public QWidget, public Ui::QmitkSelectableGLWidget
+class MitkQtWidgetsExt_EXPORT QmitkSelectableGLWidget : public QWidget, public Ui::QmitkSelectableGLWidget
 {
   public:
   QmitkSelectableGLWidget(QWidget* parent=0);
   mitk::VtkPropRenderer* GetRenderer();
   QmitkRenderWindow* GetRenderWindow() const;
   mitk::SliceNavigationController*  GetSliceNavigationController() const;
   mitk::CameraRotationController* GetCameraRotationController() const;
   mitk::BaseController* GetController() const;
   protected:
   void wheelEvent( QWheelEvent * e );
     QmitkRenderWindow *m_RenderWindow;
     mitk::VtkPropRenderer::Pointer m_Renderer;
 };
 
 #endif