diff --git a/src/TerminalHeaderBar.h b/src/TerminalHeaderBar.h
index 81c66779..70ca83c5 100644
--- a/src/TerminalHeaderBar.h
+++ b/src/TerminalHeaderBar.h
@@ -1,68 +1,68 @@
 /*
  *  This file is part of Konsole, a terminal emulator for KDE.
  *
  *  Copyright 2012  Frederik Gladhorn <gladhorn@kde.org>
  *
  *  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 TERMINAL_HEADER_BAR_H
 #define TERMINAL_HEADER_BAR_H
 
 #include <QWidget>
 #include <QPoint>
 
 class QLabel;
 class QToolButton;
 class QBoxLayout;
 namespace Konsole {
     class TerminalDisplay;
     class ViewProperties;
 
 class TerminalHeaderBar : public QWidget {
     Q_OBJECT
 public:
     // TODO: Verify if the terminalDisplay is needed, or some other thing like SessionController.
-    TerminalHeaderBar(QWidget *parent = nullptr);
+    explicit TerminalHeaderBar(QWidget *parent = nullptr);
     void finishHeaderSetup(ViewProperties *properties);
 
     void terminalFocusIn();
     void terminalFocusOut();
 
 protected:
     void paintEvent(QPaintEvent* ev) override;
     void mousePressEvent(QMouseEvent *ev) override;
     void mouseReleaseEvent(QMouseEvent *ev) override;
     void mouseMoveEvent(QMouseEvent *ev) override;
 
 Q_SIGNALS:
     void requestToggleExpansion();
 
 private:
     QBoxLayout *m_boxLayout;
     TerminalDisplay *m_terminalDisplay;
     QLabel *m_terminalTitle;
     QLabel *m_terminalIcon;
     QLabel *m_terminalActivity; // Bell icon.
     QToolButton *m_closeBtn;
     QToolButton *m_toggleExpandedMode;
     bool m_terminalIsFocused;
     QPoint m_startDrag;
 };
 
 } // namespace Konsole
 
 #endif