diff --git a/Modules/VtkShaders/mitkVtkShaderProgram.cpp b/Modules/VtkShaders/mitkVtkShaderProgram.cpp
index 4304155c85..c9bb221601 100644
--- a/Modules/VtkShaders/mitkVtkShaderProgram.cpp
+++ b/Modules/VtkShaders/mitkVtkShaderProgram.cpp
@@ -1,32 +1,33 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 
 #include "mitkVtkShaderProgram.h"
 #include "vtkShader2.h"
 
 mitk::VtkShaderProgram::VtkShaderProgram()
+  : m_VtkShaderProgram(NULL)
 {
 }
 
 mitk::VtkShaderProgram::~VtkShaderProgram()
 {
 }
 
 void mitk::VtkShaderProgram::SetVtkShaderProgram(vtkShaderProgram2* p) { m_VtkShaderProgram = p; }
 
 vtkShaderProgram2*mitk::VtkShaderProgram::GetVtkShaderProgram() const { return m_VtkShaderProgram; }
 
 itk::TimeStamp&mitk::VtkShaderProgram::GetShaderTimestampUpdate(){return m_ShaderTimestampUpdate;}