diff --git a/orientation_sensor.h b/orientation_sensor.h
index d9786a8f1..90c6c4c3a 100644
--- a/orientation_sensor.h
+++ b/orientation_sensor.h
@@ -1,92 +1,91 @@
 /********************************************************************
  KWin - the KDE window manager
  This file is part of the KDE project.
 
 Copyright (C) 2017 Martin Flöser <mgraesslin@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, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #pragma once
 
 #include <QObject>
 
 #include <KSharedConfig>
 
 #include <kwin_export.h>
 
 class QOrientationSensor;
-class OrientationSensorAdaptor;
 class KStatusNotifierItem;
 
 namespace KWin
 {
 
 class KWIN_EXPORT OrientationSensor : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(bool userEnabled READ isUserEnabled WRITE setUserEnabled NOTIFY userEnabledChanged)
 public:
     explicit OrientationSensor(QObject *parent = nullptr);
     ~OrientationSensor() override;
 
     void setEnabled(bool enabled);
 
     /**
      * Just like QOrientationReading::Orientation,
      * copied to not leak the QSensors API into internal API.
      */
     enum class Orientation {
         Undefined,
         TopUp,
         TopDown,
         LeftUp,
         RightUp,
         FaceUp,
         FaceDown
     };
     Q_ENUM(Orientation)
 
     Orientation orientation() const {
         return m_orientation;
     }
 
     void setConfig(KSharedConfig::Ptr config) {
         m_config = config;
     }
 
     bool isUserEnabled() const {
         return m_userEnabled;
     }
     void setUserEnabled(bool enabled);
 
 Q_SIGNALS:
     void orientationChanged();
     void userEnabledChanged(bool);
 
 private:
     void startStopSensor();
     void loadConfig();
     void refresh();
     void activate();
     void updateState();
 
     QOrientationSensor *m_sensor;
     bool m_enabled = false;
     bool m_userEnabled = true;
     Orientation m_orientation = Orientation::Undefined;
     KStatusNotifierItem *m_sni = nullptr;
     KSharedConfig::Ptr m_config;
 };
 
 }