diff --git a/core/utilities/maintenance/maintenancetool.cpp b/core/utilities/maintenance/maintenancetool.cpp
index bce2d2ac59..7f9bb555ca 100644
--- a/core/utilities/maintenance/maintenancetool.cpp
+++ b/core/utilities/maintenance/maintenancetool.cpp
@@ -1,112 +1,112 @@
 /* ============================================================
  *
  * This file is a part of digiKam project
  * https://www.digikam.org
  *
  * Date        : 2012-02-02
  * Description : maintenance tool
  *
  * Copyright (C) 2012-2020 by Gilles Caulier <caulier dot gilles at gmail dot com>
  * Copyright (C) 2012      by Andi Clemens <andi dot clemens at gmail dot 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, 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.
  *
  * ============================================================ */
 
 #include "maintenancetool.h"
 
 // Qt includes
 
 #include <QTime>
 #include <QTimer>
 #include <QApplication>
 
 // KDE includes
 
 #include <klocalizedstring.h>
 
 // Local includes
 
 #include "digikam_debug.h"
 #include "dnotificationwrapper.h"
 
 namespace Digikam
 {
 
 class Q_DECL_HIDDEN MaintenanceTool::Private
 {
 public:
 
     explicit Private()
        : notification(true)
     {
     }
 
     bool  notification;
     QTime duration;
 };
 
 MaintenanceTool::MaintenanceTool(const QString& id, ProgressItem* const parent)
     : ProgressItem(parent, id, QString(), QString(), true, true),
       d(new Private)
 {
     // --- NOTE: use dynamic binding as slotCancel() is a virtual method which can be re-implemented in derived classes.
 
-    connect(this, static_cast<void (ProgressItem::*)(const QString&)>(&ProgressItem::progressItemCanceled),
+    connect(this, static_cast<void (Digikam::ProgressItem::*)(const QString&)>(&Digikam::ProgressItem::progressItemCanceled),
             this, &MaintenanceTool::slotCancel);
 }
 
 MaintenanceTool::~MaintenanceTool()
 {
     delete d;
 }
 
 void MaintenanceTool::setNotificationEnabled(bool b)
 {
     d->notification = b;
 }
 
 void MaintenanceTool::start()
 {
     // We delay start to be sure that eventloop connect signals and slots in top level.
     QTimer::singleShot(0, this, SLOT(slotStart()));
 }
 
 void MaintenanceTool::slotStart()
 {
     d->duration.start();
 }
 
 void MaintenanceTool::slotDone()
 {
     QTime t = QTime::fromMSecsSinceStartOfDay(d->duration.elapsed());
 
     if (d->notification)
     {
         // Pop-up a message to bring user when all is done.
         DNotificationWrapper(id(),
                              i18n("Process is done.\nDuration: %1", t.toString()),
                              qApp->activeWindow(), label());
     }
 
     emit signalComplete();
 
     setComplete();
 }
 
 void MaintenanceTool::slotCancel()
 {
     setComplete();
     emit signalCanceled();
 }
 
 } // namespace Digikam