diff --git a/src/wrtembed/KReportPropertiesButton.h b/src/wrtembed/KReportPropertiesButton.h
index 9d16eca9..9b600df2 100644
--- a/src/wrtembed/KReportPropertiesButton.h
+++ b/src/wrtembed/KReportPropertiesButton.h
@@ -1,34 +1,34 @@
 /* This file is part of the KDE project
    Copyright (C) 2010 by Adam Pigg (adam@piggz.co.uk)
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
 
    This library 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 
 #ifndef REPORTPROPERTIESBUTTON_H
 #define REPORTPROPERTIESBUTTON_H
 
 #include <QCheckBox>
 
 class KReportPropertiesButton : public QCheckBox
 {
     Q_OBJECT
 public:
-    explicit KReportPropertiesButton(QWidget*);
+    explicit KReportPropertiesButton(QWidget *parent = nullptr);
 protected:
     void paintEvent(QPaintEvent*) override;
 };
 
 #endif // REPORTPROPERTIESBUTTON_H