diff --git a/Core/Code/Common/mitkCoreServices.h b/Core/Code/Common/mitkCoreServices.h
index 4799f92bd2..32ddf9cec2 100644
--- a/Core/Code/Common/mitkCoreServices.h
+++ b/Core/Code/Common/mitkCoreServices.h
@@ -1,138 +1,140 @@
 /*===================================================================
 
 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 MITKCORESERVICES_H
 #define MITKCORESERVICES_H
 
 #include "MitkExports.h"
 
 #include <mitkLogMacros.h>
 
 #include <usGetModuleContext.h>
 #include <usModuleContext.h>
 #include <usServiceInterface.h>
 #include <usServiceReference.h>
 
+#include <cassert>
+
 namespace mitk {
 
 struct IShaderRepository;
 
 /**
  * @brief Access MITK core services.
  *
  * This class can be used to conveniently access common
  * MITK Core service objects. All getter methods are guaranteed
  * to return a non-NULL service object.
  *
  * To ensure that CoreServices::Unget() is called after the caller
  * has finished using a service object, you should use the CoreServicePointer
  * helper class which calls Unget() when it goes out of scope:
  *
  * \code
  * CoreServicePointer<IShaderRepository> shaderRepo(CoreServices::GetShaderRepository());
  * // Do something with shaderRepo
  * \endcode
  *
  * @see CoreServicePointer
  */
 class MITK_CORE_EXPORT CoreServices
 {
 public:
 
   /**
    * @brief Get a IShaderRepository instance.
    * @param context The module context of the module getting the service.
    * @return A non-NULL IShaderRepository instance.
    */
   static IShaderRepository* GetShaderRepository(us::ModuleContext* context = us::GetModuleContext());
 
   /**
    * @brief Unget a previously acquired service instance.
    * @param service The service instance to be released.
    * @return \c true if ungetting the service was successful, \c false otherwise.
    */
   template<class S>
   static bool Unget(S* service, us::ModuleContext* context = us::GetModuleContext())
   {
     return Unget(context, us_service_interface_iid<S>(), service);
   }
 
 private:
 
   static bool Unget(us::ModuleContext* context, const std::string& interfaceId, void* service);
 
   static std::map<us::ModuleContext*, std::map<void*,us::ServiceReferenceU> > m_ContextToServicesMap;
 
   // purposely not implemented
   CoreServices();
   CoreServices(const CoreServices&);
   CoreServices& operator=(const CoreServices&);
 };
 
 /**
  * @brief A RAII helper class for core service objects.
  *
  * This is class is intended for usage in local scopes; it calls
  * CoreServices::Unget(S*) in its destructor. You should not construct
  * multiple CoreServicePointer instances using the same service pointer,
  * unless it is retrieved by a new call to a CoreServices getter method.
  *
  * @see CoreServices
  */
 template<class S>
 class CoreServicePointer
 {
 public:
 
   explicit CoreServicePointer(S* service)
     : m_service(service)
   {
     assert(m_service);
   }
 
   ~CoreServicePointer()
   {
     try
     {
       CoreServices::Unget(m_service);
     }
     catch (const std::exception& e)
     {
       MITK_ERROR << e.what();
     }
     catch (...)
     {
       MITK_ERROR << "Ungetting core service failed.";
     }
   }
 
   S* operator->() const
   {
     return m_service;
   }
 
 private:
 
   // purposely not implemented
   CoreServicePointer(const CoreServicePointer&);
   CoreServicePointer& operator=(const CoreServicePointer&);
 
   S* const m_service;
 };
 
 }
 
 #endif // MITKCORESERVICES_H