diff --git a/libs/ui/tool/kis_stabilized_events_sampler.h b/libs/ui/tool/kis_stabilized_events_sampler.h
index 20a7280e95..8331665258 100644
--- a/libs/ui/tool/kis_stabilized_events_sampler.h
+++ b/libs/ui/tool/kis_stabilized_events_sampler.h
@@ -1,87 +1,87 @@
 /*
  *  Copyright (c) 2016 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef __KIS_STABILIZED_EVENTS_SAMPLER_H
 #define __KIS_STABILIZED_EVENTS_SAMPLER_H
 
 #include <QScopedPointer>
 
 #include <boost/iterator/iterator_facade.hpp>
 
 #include "kritaui_export.h"
 
 class KisPaintInformation;
 #include <kis_paint_information.h>
 
 
 class KRITAUI_EXPORT KisStabilizedEventsSampler
 {
 public:
     KisStabilizedEventsSampler(int sampleTime = 1);
     ~KisStabilizedEventsSampler();
 
     void clear();
     void addEvent(const KisPaintInformation &pi);
     void addFinishingEvent(int numSamples);
 
 public:
-    class iterator :
+    class KRITAUI_EXPORT iterator :
         public boost::iterator_facade <iterator,
                                        KisPaintInformation const,
                                        boost::forward_traversal_tag >
     {
     public:
         iterator()
             : m_sampler(0),
               m_index(0),
               m_alpha(0) {}
 
         iterator(const KisStabilizedEventsSampler* sampler, int index, qreal alpha)
             : m_sampler(sampler),
               m_index(index),
               m_alpha(alpha) {}
 
     private:
         friend class boost::iterator_core_access;
 
         void increment() {
             m_index++;
         }
 
         bool equal(iterator const& other) const {
             return m_index == other.m_index &&
                 m_sampler == other.m_sampler;
         }
 
         const KisPaintInformation& dereference() const;
 
     private:
         const KisStabilizedEventsSampler* m_sampler;
         int m_index;
         qreal m_alpha;
     };
 
     std::pair<iterator, iterator> range() const;
 
 private:
     struct Private;
     const QScopedPointer<Private> m_d;
 };
 
 
 #endif /* __KIS_STABILIZED_EVENTS_SAMPLER_H */