diff --git a/Modules/Core/include/mitkAnnotationUtils.h b/Modules/Core/include/mitkAnnotationUtils.h
index ee4a42f2cf..6502fa70b8 100644
--- a/Modules/Core/include/mitkAnnotationUtils.h
+++ b/Modules/Core/include/mitkAnnotationUtils.h
@@ -1,95 +1,96 @@
 /*===================================================================
 
 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 mitkAnnotationUtils_h
 #define mitkAnnotationUtils_h
 
 #include <MitkCoreExports.h>
 #include <memory>
+#include <string>
 #include <vector>
 
 class vtkObject;
 
 namespace mitk
 {
   class AbstractAnnotationRenderer;
   class Annotation;
   class BaseRenderer;
 
   /**
    * @brief The AnnotationUtils class provides static functions for accsessing registered AnnotationRenderers and
    * Annotations
    */
   class MITKCORE_EXPORT AnnotationUtils
   {
   public:
     typedef std::vector<std::unique_ptr<AbstractAnnotationRenderer>> AnnotationRendererServices;
     AnnotationUtils();
     ~AnnotationUtils();
 
     /**
      * @brief GetAnnotationRenderer returns a registered AnnotationRenderer of a specific type and for a BaseRenderer
      * @param arTypeID name specifier of the AnnotationRenderer
      * @param rendererID name specifier of the BaseRenderer
      * @return
      */
     static AbstractAnnotationRenderer *GetAnnotationRenderer(const std::string &arTypeID,
                                                              const std::string &rendererID);
 
     /**
      * @brief RegisterAnnotationRenderer registers an AnnotationRenderer as a microservice and saves a reference to it
      * in a local static list.
      * @param annotationRenderer
      */
     static void RegisterAnnotationRenderer(AbstractAnnotationRenderer *annotationRenderer);
 
     /**
      * @brief GetAnnotationRenderer returns a list of registered AnnotationRenderers for a specified BaseRenderer
      * @param rendererID name specifier of the BaseRenderer
      * @return
      */
     static std::vector<AbstractAnnotationRenderer *> GetAnnotationRenderer(const std::string &rendererID);
 
     /**
      * @brief UpdateAnnotationRenderer is a convenience function which calls AbstractAnnotationRenderer::Update for each
      * registered AnnotationRenderer of a specific BaseRenderer.
      * @param rendererID
      */
     static void UpdateAnnotationRenderer(const std::string &rendererID);
 
     /**
      * @brief BaseRendererChanged has to be called in the case that the actual BaseRenderer object for a BaseRenderer ID
      * has changed. E.g. if a RenderWindow was closed and reopened.
      * @param renderer The new BaseRenderer
      */
     static void BaseRendererChanged(BaseRenderer *renderer);
 
     /**
      * @brief GetAnnotation returns a registered Annotation for a specified ID.
      * @param AnnotationID
      * @return
      */
     static mitk::Annotation *GetAnnotation(const std::string &AnnotationID);
 
   private:
     AnnotationUtils(const AnnotationUtils &);
     AnnotationUtils &operator=(const AnnotationUtils &);
 
     static void RenderWindowCallback(vtkObject *caller, unsigned long, void *, void *);
   };
 }
 
 #endif