diff --git a/kmailtransport/sendmail/sendmailconfigwidget.h b/kmailtransport/sendmail/sendmailconfigwidget.h
index bc29e6e7..9faf652c 100644
--- a/kmailtransport/sendmail/sendmailconfigwidget.h
+++ b/kmailtransport/sendmail/sendmailconfigwidget.h
@@ -1,69 +1,69 @@
 /*
   Copyright (c) 2009 Constantin Berzan <exit3219@gmail.com>
 
   Based on MailTransport code by:
   Copyright (c) 2006 - 2007 Volker Krause <vkrause@kde.org>
 
   Based on KMail code by:
   Copyright (c) 2001-2002 Michael Haeckel <haeckel@kde.org>
 
   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 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 MAILTRANSPORT_SENDMAILCONFIGWIDGET_H
 #define MAILTRANSPORT_SENDMAILCONFIGWIDGET_H
 
 #include "transportconfigwidget.h"
 
 namespace MailTransport {
 class Transport;
 
 /**
   @internal
 */
 class SendmailConfigWidgetPrivate;
 
 /**
   @internal
   Configuration widget for a Sendmail transport.
 */
 class SendmailConfigWidget : public TransportConfigWidget
 {
     Q_OBJECT
 
 public:
     explicit SendmailConfigWidget(Transport *transport, QWidget *parent = nullptr);
-    bool pathIsEmpty() const;
+    Q_REQUIRED_RESULT bool pathIsEmpty() const;
 Q_SIGNALS:
     void enableButtonOk(bool);
 
 public Q_SLOTS:
-    void apply();
+    void apply() override;
 
 private Q_SLOTS:
     void slotTextChanged(const QString &text);
 
 protected:
     SendmailConfigWidget(SendmailConfigWidgetPrivate &dd, Transport *transport, QWidget *parent);
 
 private:
     Q_DECLARE_PRIVATE(SendmailConfigWidget)
 
     void init();
 };
 } // namespace MailTransport
 
 #endif // MAILTRANSPORT_SENDMAILCONFIGWIDGET_H