diff --git a/core/smb4ksynchronizer.h b/core/smb4ksynchronizer.h
index 9390a48..2f51c27 100644
--- a/core/smb4ksynchronizer.h
+++ b/core/smb4ksynchronizer.h
@@ -1,145 +1,145 @@
 /***************************************************************************
     This is the new synchronizer of Smb4K.
                              -------------------
     begin                : Fr Feb 04 2011
     copyright            : (C) 2011-2019 by Alexander Reinholdt
     email                : alexander.reinholdt@kdemail.net
  ***************************************************************************/
 
 /***************************************************************************
  *   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, Suite 500, Boston,*
  *   MA 02110-1335, USA                                                    *
  ***************************************************************************/
 
 #ifndef SMB4KSYNCHRONIZER_H
 #define SMB4KSYNCHRONIZER_H
 
 // application specific includes
 #include "smb4kglobal.h"
 
 // Qt includes
 #include <QString>
 #include <QScopedPointer>
 
 // KDE includes
 #include <KCoreAddons/KCompositeJob>
 
 // forward declarations
 class Smb4KSynchronizerPrivate;
 
 class Q_DECL_EXPORT Smb4KSynchronizer : public KCompositeJob
 {
   Q_OBJECT
 
   friend class Smb4KSynchronizerPrivate;
 
   public:
     /**
      * The constructor
      */
     explicit Smb4KSynchronizer(QObject *parent = 0);
 
     /**
      * The destructor
      */
     ~Smb4KSynchronizer();
     
     /**
      * This function returns a static pointer to this class.
      *
      * @returns a static pointer to the Smb4KSynchronizer class.
      */
     static Smb4KSynchronizer *self();
 
     /**
      * Sets the URL for the source and destination by showing the user a
      * dialog for URL input. The URLs are then passed to the actual job that
      * does all the work.
      *
      * @param share         The Smb4KShare object
      */
     void synchronize(const SharePtr &share);
 
     /**
      * This function tells you whether the synchronizer is running
      * or not.
      *
      * @returns TRUE if the synchronizer is running and FALSE otherwise
      */
     bool isRunning();
 
     /**
      * With this function you can test whether a synchronization job 
      * for a certain share @param share is already running.
      * 
      * @returns TRUE if a synchronization process is already running
      */
     bool isRunning(const SharePtr &share);
 
     /**
      * This function either aborts the synchronization for a certain 
      * mounted share, if a valid pointer is passed, or aborts all running
      * processes.
      *
      * @param share         The Smb4KShare object
      */
-    void abort(const SharePtr &share = 0);
+    void abort(const SharePtr &share = SharePtr());
 
     /**
      * This function starts the composite job
      */
     void start() override;
 
   Q_SIGNALS:
     /**
      * This signal is emitted when a job is started. The emitted path
      * is the one of the destination.
      *
      * @param dest        The destination's URL
      */
     void aboutToStart(const QString &dest);
 
     /**
      * This signal is emitted when a job has finished. The emitted
      * URL is the one of the destination.
      *
      * @param dest        The destination's URL
      */
     void finished(const QString &dest);
     
   protected Q_SLOTS:
     /**
      * Invoked by start() function
      */
     void slotStartJobs();
     
     /**
      * Invoked when a job finished
      */
     void slotJobFinished(KJob *job);
 
     /**
      * Invoked when the application goes down
      */
     void slotAboutToQuit();
 
   private:
     /**
      * Pointer to Smb4KSearchPrivate class
      */
     const QScopedPointer<Smb4KSynchronizerPrivate> d;
 };
 
 #endif