diff --git a/plugins/dockers/smallcolorselector/KisGLImageWidget.h b/plugins/dockers/smallcolorselector/KisGLImageWidget.h
index 0e495c33ae..959522b6eb 100644
--- a/plugins/dockers/smallcolorselector/KisGLImageWidget.h
+++ b/plugins/dockers/smallcolorselector/KisGLImageWidget.h
@@ -1,73 +1,73 @@
 /*
  *  Copyright (c) 2019 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  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 KISGLIMAGEWIDGET_H
 #define KISGLIMAGEWIDGET_H
 
 #include <QOpenGLWidget>
 #include <QOpenGLFunctions>
 #include <QOpenGLTexture>
 #include <QOpenGLShaderProgram>
 #include <QOpenGLVertexArrayObject>
 #include <QOpenGLBuffer>
 #include <QTransform>
 #include <KisGLImageF16.h>
 #include <opengl/KisSurfaceColorSpace.h>
 
 
 class KisGLImageWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
     Q_OBJECT
 public:
     KisGLImageWidget(QWidget *parent = nullptr);
     KisGLImageWidget(KisSurfaceColorSpace colorSpace,
                      QWidget *parent = nullptr);
 
     ~KisGLImageWidget();
 
-    void initializeGL();
-    void paintGL();
+    void initializeGL() override;
+    void paintGL() override;
 
     void loadImage(const KisGLImageF16 &image);
 
     void paintEvent(QPaintEvent *event) override;
     void resizeEvent(QResizeEvent *event) override;
 
-    QSize sizeHint() const;
+    QSize sizeHint() const override;
 
 public Q_SLOTS:
 
 private Q_SLOTS:
     void slotOpenGLContextDestroyed();
 
 private:
     void updateVerticesBuffer(const QRect &rect);
 
 private:
     KisGLImageF16 m_sourceImage;
 
     QScopedPointer<QOpenGLShaderProgram> m_shader;
     QOpenGLVertexArrayObject m_vao;
     QOpenGLBuffer m_verticesBuffer;
     QOpenGLBuffer m_textureVerticesBuffer;
     QOpenGLTexture m_texture;
 
     bool m_havePendingTextureUpdate = false;
 };
 
 #endif // KISGLIMAGEWIDGET_H