diff --git a/src/gamebackground.cpp b/src/gamebackground.cpp
index c2f987f..09070d6 100644
--- a/src/gamebackground.cpp
+++ b/src/gamebackground.cpp
@@ -1,68 +1,68 @@
 /* Copyright (C) 2019 Christian Krippendorf <Coding@Christian-Krippendorf.de>
  *
  * Kmahjongg 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. */
 
 // own
 #include "gamebackground.h"
 
 // Qt
 #include <QGraphicsSceneMouseEvent>
 #include <QPainter>
 #include <QPixmap>
 #include <QTimer>
 
 
 GameBackground::GameBackground(QGraphicsObject * item)
     : QGraphicsObject(item)
     , m_width(100)
     , m_height(100)
 {
 }
 
 GameBackground::~GameBackground()
 {
 }
 
 void GameBackground::setSize(qreal width, qreal height)
 {
     m_width = width;
     m_height = height;
 }
 
 void GameBackground::prepareForGeometryChange()
 {
     prepareGeometryChange();
 }
 
 void GameBackground::paint(QPainter *painter, const QStyleOptionGraphicsItem *, 
     QWidget *)
 {
     painter->fillRect(QRectF(0, 0, m_width, m_height), m_background);
 }
 
-void GameBackground::setBackground(QBrush background)
+void GameBackground::setBackground(const QBrush & background)
 {
     m_background = background;
 }
 
 QRectF GameBackground::boundingRect() const
 {
     return QRectF(QPointF(0.0, 0.0), QSizeF(m_width, m_height));
 }
 
 QRectF GameBackground::rect() const
 {
     return boundingRect();
 }
diff --git a/src/gamebackground.h b/src/gamebackground.h
index fca8a86..347f71e 100644
--- a/src/gamebackground.h
+++ b/src/gamebackground.h
@@ -1,87 +1,87 @@
 /* Copyright (C) 2019 Christian Krippendorf <Coding@Christian-Krippendorf.de>
  *
  * Kmahjongg 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 GAMEBACKGROUND_H
 #define GAMEBACKGROUND_H
 
 // Qt
 #include <QGraphicsObject>
 #include <QObject>
 #include <QBrush>
 
 // KMahjongg
 #include "kmtypes.h"
 
 
 /**
  * The background item of the kmahjongg board.
  * @author Christian Krippendorf 
  */
 class GameBackground : public QGraphicsObject
 {
     Q_OBJECT
 
 public:
     /**
      * Constructor
      * @param item The parent item
      */
     explicit GameBackground(QGraphicsObject *item = nullptr);
     ~GameBackground() override;
 
     /**
      * Set the background
      * @param facePix The pixmap of the face
      */
-    void setBackground(QBrush background);
+    void setBackground(const QBrush & background);
 
     /**
      * Overrides the paint method of QGraphicsItem
      */
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
             QWidget *widget) override;
 
     /**
      * Set size of element
      * @param width Width of element in pixels
      * @param height Height of element in pixels
      */
     void setSize(qreal width, qreal height);
     
     /**
      * Overrides the boundingRect method of QGraphicsItem
      */
     QRectF boundingRect() const override;
 
     /**
      * Returns the rect of the item
      * @return The rect of the item
      */
     QRectF rect() const;
 
     /**
      * Called in GameView::resizeTileset() before reloading the tiles
      */
     void prepareForGeometryChange();
 
 private:
     QBrush m_background;
 
     qreal m_width;
     qreal m_height;
 };
 
 #endif // GAMEBACKGROUND_H