diff --git a/Modules/OpenIGTLink/mitkIGTLDummyMessage.h b/Modules/OpenIGTLink/mitkIGTLDummyMessage.h
index 61217dcdf5..512595fb00 100644
--- a/Modules/OpenIGTLink/mitkIGTLDummyMessage.h
+++ b/Modules/OpenIGTLink/mitkIGTLDummyMessage.h
@@ -1,72 +1,72 @@
 /*===================================================================
 
 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 MITKIGTLDUMMYMESSAGE_H
 #define MITKIGTLDUMMYMESSAGE_H
 
 #include "MitkOpenIGTLinkExports.h"
 
 #include "igtlObject.h"
 #include "igtlStringMessage.h"
 #include "mitkIGTLMessageCloneHandler.h"
 
 namespace mitk
 {
 
 /** Documentation
 * \class IGTLDummyMessage
 * \brief This class is a dummy message to show the how to implement a new message
 * type
 */
 class MITKOPENIGTLINK_EXPORT IGTLDummyMessage: public igtl::StringMessage
 {
 public:
   typedef IGTLDummyMessage                     Self;
   typedef StringMessage                        Superclass;
   typedef igtl::SmartPointer<Self>             Pointer;
   typedef igtl::SmartPointer<const Self>       ConstPointer;
 
   igtlTypeMacro( mitk::IGTLDummyMessage, igtl::StringMessage )
   igtlNewMacro( mitk::IGTLDummyMessage )
 
 public:
   /**
    * Set dummy string
   */
   void SetDummyString( const std::string& dummyString );
 
   /**
    * Get dummy string
   */
   std::string GetDummyString();
 
   /**
    * Returns a clone of itself
-  */
-  igtl::MessageBase::Pointer Clone();
+   */
+  igtl::MessageBase::Pointer Clone() override;
 
 protected:
   IGTLDummyMessage();
   ~IGTLDummyMessage() override;
 
   std::string m_dummyString;
 };
 
 mitkIGTMessageCloneClassMacro(IGTLDummyMessage, DummyMsgCloneHandler)
 
 } // namespace mitk
 
 #endif