diff --git a/Modules/QtWidgets/QmitkDataStorageFilterProxyModel.h b/Modules/QtWidgets/QmitkDataStorageFilterProxyModel.h
index 05b5f719fc..90b318e301 100644
--- a/Modules/QtWidgets/QmitkDataStorageFilterProxyModel.h
+++ b/Modules/QtWidgets/QmitkDataStorageFilterProxyModel.h
@@ -1,63 +1,63 @@
 /*===================================================================
 
 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 QMITKDATASTORAGEFILTERPROXYMODEL_H_
 #define QMITKDATASTORAGEFILTERPROXYMODEL_H_
 
 #include <MitkQtWidgetsExports.h>
 
 #include <mitkDataStorage.h>
 #include <mitkNodePredicateBase.h>
 
 #include <QSortFilterProxyModel>
 
 #include <set>
 
 /// \ingroup QmitkModule
 class QMITK_EXPORT QmitkDataStorageFilterProxyModel : public QSortFilterProxyModel
 {
 //# CTORS,DTOR
 public:
     QmitkDataStorageFilterProxyModel(QObject* parent = 0);
     ~QmitkDataStorageFilterProxyModel();
 
 public:
     ///
     /// If the predicate pred returns true, the node will be hidden in the data manager view
     ///
     void AddFilterPredicate(mitk::NodePredicateBase::Pointer pred);
 
     ///
     /// Remove a predicate from the list of filters. Returns true if pred was found and removed.
     ///
     bool RemoveFilterPredicate(mitk::NodePredicateBase::Pointer pred);
 
     ///
     /// Check if predicate is present in the list of filtering predicates.
     ///
     bool HasFilterPredicate(mitk::NodePredicateBase::Pointer pred);
 
 //#
 protected:
-    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
+    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;
 
 protected:
     typedef std::set<mitk::NodePredicateBase::Pointer> FilterPredicatesCollection;
     FilterPredicatesCollection m_Predicates;
 };
 
 #endif /* QMITKDATASTORAGEFILTERPROXYMODEL_H_ */