diff --git a/src/controls/QskSpinBox.cpp b/src/controls/QskSpinBox.cpp
index eaec9825..186d4db6 100644
--- a/src/controls/QskSpinBox.cpp
+++ b/src/controls/QskSpinBox.cpp
@@ -1,21 +1,24 @@
 /******************************************************************************
- * Copyright (C) 2023 Edelhirsch Software GmbH
- * This file may be used under the terms of the 3-clause BSD License
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
  *****************************************************************************/
 
 #include "QskSpinBox.h"
-#include <QskLinearBox.h>
-#include <QskGridBox.h>
-#include <QskTextInput.h>
-#include <QskBoxShapeMetrics.h>
-#include <QskBoxBorderColors.h>
-#include <QskBoxBorderMetrics.h>
-#include <QskSkinlet.h>
-#include <QskEvent.h>
+#include "QskLinearBox.h"
+#include "QskGridBox.h"
+#include "QskTextInput.h"
+#include "QskBoxShapeMetrics.h"
+#include "QskBoxBorderColors.h"
+#include "QskBoxBorderMetrics.h"
+#include "QskSkinlet.h"
+#include "QskIntervalF.h"
+#include "QskEvent.h"
+
 #include <QtMath>
 #include <QGuiApplication>
 #include <QStyleHints>
-#include <QskIntervalF.h>
+
+#include <array>
 
 QSK_SUBCONTROL(QskSpinBox, Inc)
 QSK_SUBCONTROL(QskSpinBox, Dec)
diff --git a/src/controls/QskSpinBox.h b/src/controls/QskSpinBox.h
index 9222b6e2..0f4db5d6 100644
--- a/src/controls/QskSpinBox.h
+++ b/src/controls/QskSpinBox.h
@@ -1,48 +1,49 @@
 /******************************************************************************
- * Copyright (C) 2023 Edelhirsch Software GmbH
- * This file may be used under the terms of the 3-clause BSD License
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
  *****************************************************************************/
 
-#pragma once
+#ifndef QSK_SPIN_BOX_H
+#define QSK_SPIN_BOX_H
 
-#include <QskControl.h>
-#include <QskPushButton.h>
 #include <QskBoundedInput.h>
 
 class QSK_EXPORT QskSpinBox : public QskBoundedInput
 {
-  Q_OBJECT
-  using Inherited = QskBoundedInput;
+    Q_OBJECT
+    Q_PROPERTY(qreal value READ value NOTIFY valueChanged)
+
+    using Inherited = QskBoundedInput;
 public:
-  Q_PROPERTY(qreal value READ value NOTIFY valueChanged)
-  QSK_SUBCONTROLS(Inc, Dec, IncText, DecText, TextPanel, Text, Layout)
-  QSK_STATES( Pressed )
+    QSK_SUBCONTROLS(Inc, Dec, IncText, DecText, TextPanel, Text, Layout)
+    QSK_STATES( Pressed )
 
-  explicit QskSpinBox( QQuickItem* parent = nullptr );
-  ~QskSpinBox() override;
+    explicit QskSpinBox( QQuickItem* parent = nullptr );
+    ~QskSpinBox() override;
 
-  void increment( qreal offset ) override;
-  qreal value() const;
+    void increment( qreal offset ) override;
+    qreal value() const;
 
 Q_SIGNALS:
-  void valueChanged(qreal value);
+    void valueChanged( qreal );
+    void focusIndexChanged( int );
 
 private:
-  Q_SIGNAL void focusIndexChanged(int index);
+    void hoverEnterEvent( QHoverEvent* ) override;
+    void hoverLeaveEvent( QHoverEvent* ) override;
+    void hoverMoveEvent( QHoverEvent* ) override;
 
-  void hoverEnterEvent( QHoverEvent* event) override;
-  void hoverLeaveEvent( QHoverEvent* event) override;
-  void hoverMoveEvent( QHoverEvent* event) override;
+    void mouseReleaseEvent( QMouseEvent* ) override;
+    void mousePressEvent( QMouseEvent* ) override;
 
-  void mouseReleaseEvent(QMouseEvent* event) override;
-  void mousePressEvent(QMouseEvent* event) override;
+    void keyPressEvent( QKeyEvent* ) override;
+    void keyReleaseEvent( QKeyEvent* ) override;
 
-  void keyPressEvent( QKeyEvent* event ) override;
-  void keyReleaseEvent( QKeyEvent* event ) override;
+    void focusInEvent( QFocusEvent* ) override;
+    QRectF focusIndicatorRect() const override;
 
-  void focusInEvent(QFocusEvent* event) override;
-  QRectF focusIndicatorRect() const override;
-
-  class PrivateData;
-  std::unique_ptr<PrivateData> m_data;
+    class PrivateData;
+    std::unique_ptr<PrivateData> m_data;
 };
+
+#endif
diff --git a/src/controls/QskSpinBoxSkinlet.cpp b/src/controls/QskSpinBoxSkinlet.cpp
index 71a22b83..b0d9961f 100644
--- a/src/controls/QskSpinBoxSkinlet.cpp
+++ b/src/controls/QskSpinBoxSkinlet.cpp
@@ -1,11 +1,12 @@
 /******************************************************************************
- * Copyright (C) 2023 Edelhirsch Software GmbH
- * This file may be used under the terms of the 3-clause BSD License
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
  *****************************************************************************/
 
 #include "QskSpinBoxSkinlet.h"
 #include "QskSpinBox.h"
-#include <QFontMetrics>
+
+#include <qfontmetrics.h>
 
 const auto INC_TEXT = QStringLiteral("+");
 const auto DEC_TEXT = QStringLiteral("-");
diff --git a/src/controls/QskSpinBoxSkinlet.h b/src/controls/QskSpinBoxSkinlet.h
index ab6cbf65..7cbee6ec 100644
--- a/src/controls/QskSpinBoxSkinlet.h
+++ b/src/controls/QskSpinBoxSkinlet.h
@@ -1,28 +1,48 @@
 /******************************************************************************
- * Copyright (C) 2023 Edelhirsch Software GmbH
- * This file may be used under the terms of the 3-clause BSD License
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
  *****************************************************************************/
 
-#pragma once
+#ifndef QSK_SPIN_BOX_SKINLET_H
+#define QSK_SPIN_BOX_SKINLET_H
 
 #include <QskSkinlet.h>
 
 class QSK_EXPORT QskSpinBoxSkinlet : public QskSkinlet
 {
-  Q_GADGET
-  using Inherited = QskSkinlet;
-public:
-  enum NodeRole
-  {
-    IncPanel, IncText, DecPanel, DecText, TextPanel, TextText, RoleCount
-  };
-  Q_INVOKABLE QskSpinBoxSkinlet( QskSkin* = nullptr );
-protected:
-  int sampleCount( const QskSkinnable*, QskAspect::Subcontrol ) const override;
-  QRectF sampleRect( const QskSkinnable*, const QRectF&, QskAspect::Subcontrol, int index ) const override;
-  QskAspect::States sampleStates(const QskSkinnable* skinnable, QskAspect::Subcontrol subControl, int index ) const override;
-  QSizeF sizeHint( const QskSkinnable*, Qt::SizeHint, const QSizeF& ) const override;
-  QRectF subControlRect( const QskSkinnable*, const QRectF&, QskAspect::Subcontrol ) const override;
-  QSGNode* updateSubNode( const QskSkinnable*, quint8 nodeRole, QSGNode* ) const override;
-  QSGNode* updateSampleNode( const QskSkinnable* skinnable, QskAspect::Subcontrol subControl, int index, QSGNode* node ) const override;
+    Q_GADGET
+    using Inherited = QskSkinlet;
+
+  public:
+    enum NodeRole
+    {
+        IncPanel,
+        IncText,
+        DecPanel,
+        DecText,
+        TextPanel,
+        TextText,
+        RoleCount
+    };
+
+    Q_INVOKABLE QskSpinBoxSkinlet( QskSkin* = nullptr );
+
+  protected:
+    int sampleCount( const QskSkinnable*, QskAspect::Subcontrol ) const override;
+
+    QRectF sampleRect( const QskSkinnable*, const QRectF&,
+        QskAspect::Subcontrol, int index ) const override;
+
+    QskAspect::States sampleStates( const QskSkinnable*,
+        QskAspect::Subcontrol, int index ) const override;
+
+    QSizeF sizeHint( const QskSkinnable*, Qt::SizeHint, const QSizeF& ) const override;
+    QRectF subControlRect( const QskSkinnable*,
+        const QRectF&, QskAspect::Subcontrol ) const override;
+
+    QSGNode* updateSubNode( const QskSkinnable*, quint8 nodeRole, QSGNode* ) const override;
+    QSGNode* updateSampleNode( const QskSkinnable*,
+        QskAspect::Subcontrol, int index, QSGNode* node ) const override;
 };
+
+#endif