diff --git a/MainWindow/UpdateVideoThumbnail.cpp b/MainWindow/UpdateVideoThumbnail.cpp
index 60968a43..42e8a20c 100644
--- a/MainWindow/UpdateVideoThumbnail.cpp
+++ b/MainWindow/UpdateVideoThumbnail.cpp
@@ -1,89 +1,89 @@
 /* Copyright (C) 2012-2020 The KPhotoAlbum Development Team
 
    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) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    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/>.
 */
 
 #include "UpdateVideoThumbnail.h"
 
 #include "Window.h"
 
 #include <BackgroundJobs/HandleVideoThumbnailRequestJob.h>
 #include <ImageManager/ThumbnailCache.h>
 #include <ThumbnailView/CellGeometry.h>
 #include <Utilities/FileUtil.h>
 #include <Utilities/VideoUtil.h>
 
-namespace MainWindow
+namespace
 {
 
-void UpdateVideoThumbnail::useNext(const DB::FileNameList &list)
+DB::FileName nextExistingImage(const DB::FileName &fileName, int frame, int direction)
 {
-    update(list, +1);
-}
-
-void UpdateVideoThumbnail::usePrevious(const DB::FileNameList &list)
-{
-    update(list, -1);
-}
-
-void UpdateVideoThumbnail::update(const DB::FileNameList &list, int direction)
-{
-    for (const DB::FileName &fileName : list) {
-        if (Utilities::isVideo(fileName))
-            update(fileName, direction);
+    for (int i = 1; i < 10; ++i) {
+        const int nextIndex = (frame + 10 + direction * i) % 10;
+        const DB::FileName file = BackgroundJobs::HandleVideoThumbnailRequestJob::frameName(fileName, nextIndex);
+        if (file.exists())
+            return file;
     }
+    Q_ASSERT(false && "We should always find at least the current frame");
+    return DB::FileName();
 }
 
-void UpdateVideoThumbnail::update(const DB::FileName &fileName, int direction)
+void update(const DB::FileName &fileName, int direction)
 {
     const DB::FileName baseImageName = BackgroundJobs::HandleVideoThumbnailRequestJob::pathForRequest(fileName);
     QImage baseImage(baseImageName.absolute());
 
     int frame = 0;
     for (; frame < 10; ++frame) {
         const DB::FileName frameFile = BackgroundJobs::HandleVideoThumbnailRequestJob::frameName(fileName, frame);
         QImage frameImage(frameFile.absolute());
         if (frameImage.isNull())
             continue;
         if (baseImage == frameImage) {
             break;
         }
     }
 
     const DB::FileName newImageName = nextExistingImage(fileName, frame, direction);
 
     Utilities::copyOrOverwrite(newImageName.absolute(), baseImageName.absolute());
 
     QImage image = QImage(newImageName.absolute()).scaled(ThumbnailView::CellGeometry::preferredIconSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
     MainWindow::Window::theMainWindow()->thumbnailCache()->insert(fileName, image);
     MainWindow::Window::theMainWindow()->reloadThumbnails();
 }
 
-DB::FileName UpdateVideoThumbnail::nextExistingImage(const DB::FileName &fileName, int frame, int direction)
+void update(const DB::FileNameList &list, int direction)
 {
-    for (int i = 1; i < 10; ++i) {
-        const int nextIndex = (frame + 10 + direction * i) % 10;
-        const DB::FileName file = BackgroundJobs::HandleVideoThumbnailRequestJob::frameName(fileName, nextIndex);
-        if (file.exists())
-            return file;
+    for (const DB::FileName &fileName : list) {
+        if (Utilities::isVideo(fileName))
+            update(fileName, direction);
     }
-    Q_ASSERT(false && "We should always find at least the current frame");
-    return DB::FileName();
+}
+} // namespace
+
+void MainWindow::UpdateVideoThumbnail::useNext(const DB::FileNameList &list)
+{
+    update(list, +1);
+}
+
+void MainWindow::UpdateVideoThumbnail::usePrevious(const DB::FileNameList &list)
+{
+    update(list, -1);
 }
 
-} // namespace MainWindow
 // vi:expandtab:tabstop=4 shiftwidth=4:
diff --git a/MainWindow/UpdateVideoThumbnail.h b/MainWindow/UpdateVideoThumbnail.h
index d113d542..22cac318 100644
--- a/MainWindow/UpdateVideoThumbnail.h
+++ b/MainWindow/UpdateVideoThumbnail.h
@@ -1,43 +1,37 @@
-/* Copyright 2012 Jesper K. Pedersen <blackie@kde.org>
+/* Copyright 2012-2020 The KPhotoAlbum Development Team
 
    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) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    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/>.
 */
 
 #ifndef MAINWINDOW_UPDATEVIDEOTHUMBNAIL_H
 #define MAINWINDOW_UPDATEVIDEOTHUMBNAIL_H
 
 #include <DB/FileNameList.h>
 
 namespace MainWindow
 {
 
-class UpdateVideoThumbnail
+namespace UpdateVideoThumbnail
 {
-public:
-    static void useNext(const DB::FileNameList &);
-    static void usePrevious(const DB::FileNameList &);
-
-private:
-    static void update(const DB::FileNameList &, int direction);
-    static void update(const DB::FileName &fileName, int direction);
-    static DB::FileName nextExistingImage(const DB::FileName &fileName, int frame, int direction);
-};
+    void useNext(const DB::FileNameList &);
+    void usePrevious(const DB::FileNameList &);
+}
 
 } // namespace MainWindow
 
 #endif // MAINWINDOW_UPDATEVIDEOTHUMBNAIL_H
 // vi:expandtab:tabstop=4 shiftwidth=4: