diff --git a/Core/Code/DataManagement/mitkCommon.h b/Core/Code/DataManagement/mitkCommon.h
index dfb6154379..dee052362d 100644
--- a/Core/Code/DataManagement/mitkCommon.h
+++ b/Core/Code/DataManagement/mitkCommon.h
@@ -1,109 +1,110 @@
 /*=========================================================================
 
 Program:   Medical Imaging & Interaction Toolkit
 Language:  C++
 Date:      $Date$
 Version:   $Revision$
 
 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 MITK_COMMON_H_DEFINED
 #define MITK_COMMON_H_DEFINED
 
 #ifdef _MSC_VER
 // This warns about truncation to 255 characters in debug/browse info
 #pragma warning (disable : 4786)
 #pragma warning (disable : 4068 ) /* disable unknown pragma warnings */
 #endif
 
 //add only those headers here that are really necessary for all classes!
 #include "itkObject.h"
 #include "mitkConfig.h"
 #include "mitkLogMacros.h"
 #include "mitkExportMacros.h"
 
 #ifndef MITK_UNMANGLE_IPPIC
 #define mitkIpPicDescriptor mitkIpPicDescriptor
 #endif
 
 typedef unsigned int MapperSlotId;
 
 #define mitkClassMacro(className,SuperClassName) \
   typedef className        Self; \
   typedef SuperClassName      Superclass; \
   typedef itk::SmartPointer<Self> Pointer; \
   typedef itk::SmartPointer<const Self>  ConstPointer; \
     itkTypeMacro(className,SuperClassName)
 /**
 * Macro for Constructors with one parameter for classes derived from itk::Lightobject
 **/
 #define mitkNewMacro1Param(classname,type) \
 static Pointer New(type _arg) \
 { \
   Pointer smartPtr = new classname ( _arg ); \
   smartPtr->UnRegister(); \
   return smartPtr; \
 } \
 
 /**
 * Macro for Constructors with two parameters for classes derived from itk::Lightobject
 **/
 #define mitkNewMacro2Param(classname,typea,typeb) \
 static Pointer New(typea _arga, typeb _argb) \
 { \
   Pointer smartPtr = new classname ( _arga, _argb ); \
   smartPtr->UnRegister(); \
   return smartPtr; \
 } \
 
 /**
 * Macro for Constructors with three parameters for classes derived from itk::Lightobject
 **/
 #define mitkNewMacro3Param(classname,typea,typeb,typec) \
 static Pointer New(typea _arga, typeb _argb, typec _argc) \
 { \
   Pointer smartPtr = new classname ( _arga, _argb, _argc ); \
   smartPtr->UnRegister(); \
   return smartPtr; \
 } \
 
 /**
 * Macro for Constructors with three parameters for classes derived from itk::Lightobject
 **/
 #define mitkNewMacro4Param(classname,typea,typeb,typec,typed) \
 static Pointer New(typea _arga, typeb _argb, typec _argc, typed _argd) \
 { \
   Pointer smartPtr = new classname ( _arga, _argb, _argc, _argd ); \
   smartPtr->UnRegister(); \
   return smartPtr; \
 } \
 
 
 /** Get a smart const pointer to an object.  Creates the member
  * Get"name"() (e.g., GetPoints()). */
 #define mitkGetObjectMacroConst(name,type) \
   virtual type * Get##name () const \
   { \
     itkDebugMacro("returning " #name " address " << this->m_##name ); \
     return this->m_##name.GetPointer(); \
   }
 
 /** Creates a Clone() method for "Classname". Returns a smartPtr of a clone of the 
 calling object*/
 #define mitkCloneMacro(classname) \
   virtual Pointer Clone() const \
 { \
   Pointer smartPtr = new classname(*this); \
+  smartPtr->UnRegister(); \
   return smartPtr;  \
 }
 
 
 #endif // MITK_COMMON_H_DEFINED