diff --git a/src/gui/addnewtorrentdialog.h b/src/gui/addnewtorrentdialog.h
index 6f9b18fa5..eed1fc1d0 100644
--- a/src/gui/addnewtorrentdialog.h
+++ b/src/gui/addnewtorrentdialog.h
@@ -57,7 +57,7 @@ class PropListDelegate;
 class TorrentContentFilterModel;
 class TorrentFileGuard;
 
-class AddNewTorrentDialog : public QDialog
+class AddNewTorrentDialog final : public QDialog
 {
     Q_OBJECT
     Q_DISABLE_COPY(AddNewTorrentDialog)
diff --git a/src/gui/autoexpandabledialog.h b/src/gui/autoexpandabledialog.h
index 692e62587..9956e5c69 100644
--- a/src/gui/autoexpandabledialog.h
+++ b/src/gui/autoexpandabledialog.h
@@ -39,7 +39,7 @@ namespace Ui
     class AutoExpandableDialog;
 }
 
-class AutoExpandableDialog : public QDialog
+class AutoExpandableDialog final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/gui/categoryfiltermodel.h b/src/gui/categoryfiltermodel.h
index aaad75f79..6be64beb4 100644
--- a/src/gui/categoryfiltermodel.h
+++ b/src/gui/categoryfiltermodel.h
@@ -40,7 +40,7 @@ namespace BitTorrent
     class TorrentHandle;
 }
 
-class CategoryFilterModel : public QAbstractItemModel
+class CategoryFilterModel final : public QAbstractItemModel
 {
     Q_OBJECT
 
diff --git a/src/gui/categoryfilterproxymodel.h b/src/gui/categoryfilterproxymodel.h
index 9e5ee360b..7a9ead162 100644
--- a/src/gui/categoryfilterproxymodel.h
+++ b/src/gui/categoryfilterproxymodel.h
@@ -33,7 +33,7 @@
 
 class QString;
 
-class CategoryFilterProxyModel : public QSortFilterProxyModel
+class CategoryFilterProxyModel final : public QSortFilterProxyModel
 {
 public:
     explicit CategoryFilterProxyModel(QObject *parent = nullptr);
diff --git a/src/gui/categoryfilterwidget.h b/src/gui/categoryfilterwidget.h
index 1e0539092..22e0efec6 100644
--- a/src/gui/categoryfilterwidget.h
+++ b/src/gui/categoryfilterwidget.h
@@ -30,7 +30,7 @@
 
 #include <QTreeView>
 
-class CategoryFilterWidget : public QTreeView
+class CategoryFilterWidget final : public QTreeView
 {
     Q_OBJECT
     Q_DISABLE_COPY(CategoryFilterWidget)
diff --git a/src/gui/cookiesdialog.h b/src/gui/cookiesdialog.h
index 311d488d4..a4dcb527a 100644
--- a/src/gui/cookiesdialog.h
+++ b/src/gui/cookiesdialog.h
@@ -38,7 +38,7 @@ namespace Ui
     class CookiesDialog;
 }
 
-class CookiesDialog : public QDialog
+class CookiesDialog final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/gui/cookiesmodel.h b/src/gui/cookiesmodel.h
index 7d12472be..ff65dd838 100644
--- a/src/gui/cookiesmodel.h
+++ b/src/gui/cookiesmodel.h
@@ -33,7 +33,7 @@
 #include <QList>
 #include <QNetworkCookie>
 
-class CookiesModel : public QAbstractItemModel
+class CookiesModel final : public QAbstractItemModel
 {
      Q_OBJECT
 
diff --git a/src/gui/fspathedit.h b/src/gui/fspathedit.h
index 49c28f903..a87d41941 100644
--- a/src/gui/fspathedit.h
+++ b/src/gui/fspathedit.h
@@ -108,7 +108,7 @@ private:
 };
 
 /// Widget which uses QLineEdit for path editing
-class FileSystemPathLineEdit : public FileSystemPathEdit
+class FileSystemPathLineEdit final : public FileSystemPathEdit
 {
     using base = FileSystemPathEdit;
     using WidgetType = Private::FileLineEdit;
@@ -124,7 +124,7 @@ private:
 };
 
 /// Widget which uses QComboBox for path editing
-class FileSystemPathComboEdit : public FileSystemPathEdit
+class FileSystemPathComboEdit final : public FileSystemPathEdit
 {
     using base = FileSystemPathEdit;
     using WidgetType = Private::FileComboEdit;
diff --git a/src/gui/hidabletabwidget.h b/src/gui/hidabletabwidget.h
index 8c9b7b208..f8f9ee143 100644
--- a/src/gui/hidabletabwidget.h
+++ b/src/gui/hidabletabwidget.h
@@ -35,7 +35,7 @@
 class QPaintEvent;
 #endif
 
-class HidableTabWidget : public QTabWidget
+class HidableTabWidget final : public QTabWidget
 {
 public:
     explicit HidableTabWidget(QWidget *parent = nullptr);
diff --git a/src/gui/lineedit.h b/src/gui/lineedit.h
index fcb16b60d..ac04c8e64 100644
--- a/src/gui/lineedit.h
+++ b/src/gui/lineedit.h
@@ -14,7 +14,7 @@
 
 class QToolButton;
 
-class LineEdit : public QLineEdit
+class LineEdit final : public QLineEdit
 {
     Q_OBJECT
 
diff --git a/src/gui/log/logfiltermodel.h b/src/gui/log/logfiltermodel.h
index 1b2afc376..0dafdee12 100644
--- a/src/gui/log/logfiltermodel.h
+++ b/src/gui/log/logfiltermodel.h
@@ -32,7 +32,7 @@
 
 #include "base/logger.h"
 
-class LogFilterModel : public QSortFilterProxyModel
+class LogFilterModel final : public QSortFilterProxyModel
 {
     Q_OBJECT
     Q_DISABLE_COPY(LogFilterModel)
diff --git a/src/gui/log/loglistview.cpp b/src/gui/log/loglistview.cpp
index 252986b3a..f17559e62 100644
--- a/src/gui/log/loglistview.cpp
+++ b/src/gui/log/loglistview.cpp
@@ -59,7 +59,7 @@ namespace
                                                  , index.data(BaseLogModel::MessageRole).toString());
     }
 
-    class LogItemDelegate : public QStyledItemDelegate
+    class LogItemDelegate final : public QStyledItemDelegate
     {
     public:
         using QStyledItemDelegate::QStyledItemDelegate;
diff --git a/src/gui/log/loglistview.h b/src/gui/log/loglistview.h
index 1faf0df55..eddb4c16f 100644
--- a/src/gui/log/loglistview.h
+++ b/src/gui/log/loglistview.h
@@ -31,7 +31,7 @@
 
 #include <QListView>
 
-class LogListView : public QListView
+class LogListView final : public QListView
 {
     Q_OBJECT
     Q_DISABLE_COPY(LogListView)
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index 37790dd00..ac434ce9b 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -72,7 +72,7 @@ namespace Ui
     class MainWindow;
 }
 
-class MainWindow : public QMainWindow
+class MainWindow final : public QMainWindow
 {
     Q_OBJECT
 
diff --git a/src/gui/optionsdialog.cpp b/src/gui/optionsdialog.cpp
index c181b0ea0..890ef897a 100644
--- a/src/gui/optionsdialog.cpp
+++ b/src/gui/optionsdialog.cpp
@@ -150,7 +150,7 @@ namespace
     }
 }
 
-class WheelEventEater : public QObject
+class WheelEventEater final : public QObject
 {
 public:
     using QObject::QObject;
diff --git a/src/gui/optionsdialog.h b/src/gui/optionsdialog.h
index 72ee2e343..ef2422bd9 100644
--- a/src/gui/optionsdialog.h
+++ b/src/gui/optionsdialog.h
@@ -56,7 +56,7 @@ namespace Ui
     class OptionsDialog;
 }
 
-class OptionsDialog : public QDialog
+class OptionsDialog final : public QDialog
 {
     Q_OBJECT
     using ThisType = OptionsDialog;
diff --git a/src/gui/previewlistdelegate.h b/src/gui/previewlistdelegate.h
index f70c77d06..d8a0fd7a6 100644
--- a/src/gui/previewlistdelegate.h
+++ b/src/gui/previewlistdelegate.h
@@ -31,7 +31,7 @@
 
 #include <QItemDelegate>
 
-class PreviewListDelegate : public QItemDelegate
+class PreviewListDelegate final : public QItemDelegate
 {
     Q_OBJECT
     Q_DISABLE_COPY(PreviewListDelegate)
diff --git a/src/gui/previewselectdialog.h b/src/gui/previewselectdialog.h
index 8ab018121..969a594e0 100644
--- a/src/gui/previewselectdialog.h
+++ b/src/gui/previewselectdialog.h
@@ -45,7 +45,7 @@ namespace Ui
 }
 class PreviewListDelegate;
 
-class PreviewSelectDialog : public QDialog
+class PreviewSelectDialog final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/gui/private/fspathedit_p.h b/src/gui/private/fspathedit_p.h
index 66029d676..b386e915d 100644
--- a/src/gui/private/fspathedit_p.h
+++ b/src/gui/private/fspathedit_p.h
@@ -45,7 +45,7 @@ class QStringRef;
 
 namespace Private
 {
-    class FileSystemPathValidator : public QValidator
+    class FileSystemPathValidator final : public QValidator
     {
         Q_OBJECT
 
@@ -111,7 +111,7 @@ namespace Private
         virtual QWidget *widget() = 0;
     };
 
-    class FileLineEdit : public QLineEdit, public FileEditorWithCompletion
+    class FileLineEdit final : public QLineEdit, public FileEditorWithCompletion
     {
         Q_OBJECT
         Q_DISABLE_COPY(FileLineEdit)
@@ -141,7 +141,7 @@ namespace Private
         QAction *m_warningAction;
     };
 
-    class FileComboEdit : public QComboBox, public FileEditorWithCompletion
+    class FileComboEdit final : public QComboBox, public FileEditorWithCompletion
     {
         Q_OBJECT
 
diff --git a/src/gui/private/tristatewidget.h b/src/gui/private/tristatewidget.h
index 7c7091444..697561bf4 100644
--- a/src/gui/private/tristatewidget.h
+++ b/src/gui/private/tristatewidget.h
@@ -32,7 +32,7 @@
 
 class QString;
 
-class TriStateWidget : public QWidget
+class TriStateWidget final : public QWidget
 {
     Q_OBJECT
     Q_DISABLE_COPY(TriStateWidget)
diff --git a/src/gui/properties/downloadedpiecesbar.h b/src/gui/properties/downloadedpiecesbar.h
index 38bb603b9..102913ce8 100644
--- a/src/gui/properties/downloadedpiecesbar.h
+++ b/src/gui/properties/downloadedpiecesbar.h
@@ -36,7 +36,7 @@
 
 class QWidget;
 
-class DownloadedPiecesBar : public PiecesBar
+class DownloadedPiecesBar final : public PiecesBar
 {
     using base = PiecesBar;
     Q_OBJECT
diff --git a/src/gui/properties/peerlistsortmodel.h b/src/gui/properties/peerlistsortmodel.h
index d454572bc..b7dd8145b 100644
--- a/src/gui/properties/peerlistsortmodel.h
+++ b/src/gui/properties/peerlistsortmodel.h
@@ -31,7 +31,7 @@
 
 #include <QSortFilterProxyModel>
 
-class PeerListSortModel : public QSortFilterProxyModel
+class PeerListSortModel final : public QSortFilterProxyModel
 {
     Q_OBJECT
     Q_DISABLE_COPY(PeerListSortModel)
diff --git a/src/gui/properties/peerlistwidget.h b/src/gui/properties/peerlistwidget.h
index ca05acc82..c6455669a 100644
--- a/src/gui/properties/peerlistwidget.h
+++ b/src/gui/properties/peerlistwidget.h
@@ -53,7 +53,7 @@ namespace Net
     class ReverseResolution;
 }
 
-class PeerListWidget : public QTreeView
+class PeerListWidget final : public QTreeView
 {
     Q_OBJECT
 
diff --git a/src/gui/properties/pieceavailabilitybar.h b/src/gui/properties/pieceavailabilitybar.h
index 2a1eddbf2..3581b4a7e 100644
--- a/src/gui/properties/pieceavailabilitybar.h
+++ b/src/gui/properties/pieceavailabilitybar.h
@@ -31,7 +31,7 @@
 
 #include "piecesbar.h"
 
-class PieceAvailabilityBar : public PiecesBar
+class PieceAvailabilityBar final : public PiecesBar
 {
     using base = PiecesBar;
     Q_OBJECT
diff --git a/src/gui/properties/proplistdelegate.h b/src/gui/properties/proplistdelegate.h
index 016fbac98..2dbe1b21a 100644
--- a/src/gui/properties/proplistdelegate.h
+++ b/src/gui/properties/proplistdelegate.h
@@ -49,7 +49,7 @@ enum PropColumn
     AVAILABILITY
 };
 
-class PropListDelegate : public QItemDelegate
+class PropListDelegate final : public QItemDelegate
 {
     Q_OBJECT
 
diff --git a/src/gui/properties/speedplotview.h b/src/gui/properties/speedplotview.h
index acdfbc72e..7aa4da0ce 100644
--- a/src/gui/properties/speedplotview.h
+++ b/src/gui/properties/speedplotview.h
@@ -38,7 +38,7 @@
 
 class QPen;
 
-class SpeedPlotView : public QGraphicsView
+class SpeedPlotView final : public QGraphicsView
 {
     Q_OBJECT
 
diff --git a/src/gui/properties/speedwidget.h b/src/gui/properties/speedwidget.h
index cbde6ab60..79310ebd0 100644
--- a/src/gui/properties/speedwidget.h
+++ b/src/gui/properties/speedwidget.h
@@ -40,7 +40,7 @@ class QVBoxLayout;
 class PropertiesWidget;
 class SpeedPlotView;
 
-class ComboBoxMenuButton : public QComboBox
+class ComboBoxMenuButton final : public QComboBox
 {
     Q_OBJECT
 
diff --git a/src/gui/raisedmessagebox.h b/src/gui/raisedmessagebox.h
index 76a54eab6..b1a324f26 100644
--- a/src/gui/raisedmessagebox.h
+++ b/src/gui/raisedmessagebox.h
@@ -31,7 +31,7 @@
 
 #include <QMessageBox>
 
-class RaisedMessageBox : public QMessageBox
+class RaisedMessageBox final : public QMessageBox
 {
   Q_OBJECT
 
diff --git a/src/gui/rss/feedlistwidget.h b/src/gui/rss/feedlistwidget.h
index 9fcf7eadb..47b343e96 100644
--- a/src/gui/rss/feedlistwidget.h
+++ b/src/gui/rss/feedlistwidget.h
@@ -41,7 +41,7 @@ namespace RSS
     class Item;
 }
 
-class FeedListWidget : public QTreeWidget
+class FeedListWidget final : public QTreeWidget
 {
     Q_OBJECT
 
diff --git a/src/gui/rss/htmlbrowser.h b/src/gui/rss/htmlbrowser.h
index d2497540d..baf35f47c 100644
--- a/src/gui/rss/htmlbrowser.h
+++ b/src/gui/rss/htmlbrowser.h
@@ -36,7 +36,7 @@ class QNetworkAccessManager;
 class QNetworkDiskCache;
 class QNetworkReply;
 
-class HtmlBrowser : public QTextBrowser
+class HtmlBrowser final : public QTextBrowser
 {
     Q_OBJECT
 
@@ -44,7 +44,7 @@ public:
     explicit HtmlBrowser(QWidget* parent = nullptr);
     ~HtmlBrowser();
 
-    virtual QVariant loadResource(int type, const QUrl &name) override;
+    QVariant loadResource(int type, const QUrl &name) override;
 
 protected:
     QNetworkAccessManager *m_netManager;
diff --git a/src/gui/scanfoldersdelegate.h b/src/gui/scanfoldersdelegate.h
index 086a00a67..3502f6342 100644
--- a/src/gui/scanfoldersdelegate.h
+++ b/src/gui/scanfoldersdelegate.h
@@ -39,7 +39,7 @@ class QTreeView;
 
 class PropertiesWidget;
 
-class ScanFoldersDelegate : public QItemDelegate
+class ScanFoldersDelegate final : public QItemDelegate
 {
     Q_OBJECT
 
diff --git a/src/gui/search/pluginselectdialog.h b/src/gui/search/pluginselectdialog.h
index fe394d802..f1896b41f 100644
--- a/src/gui/search/pluginselectdialog.h
+++ b/src/gui/search/pluginselectdialog.h
@@ -48,7 +48,7 @@ namespace Ui
     class PluginSelectDialog;
 }
 
-class PluginSelectDialog : public QDialog
+class PluginSelectDialog final : public QDialog
 {
     Q_OBJECT
     Q_DISABLE_COPY(PluginSelectDialog)
diff --git a/src/gui/search/searchjobwidget.h b/src/gui/search/searchjobwidget.h
index 732208754..e1021ec84 100644
--- a/src/gui/search/searchjobwidget.h
+++ b/src/gui/search/searchjobwidget.h
@@ -51,7 +51,7 @@ namespace Ui
     class SearchJobWidget;
 }
 
-class SearchJobWidget : public QWidget
+class SearchJobWidget final : public QWidget
 {
     Q_OBJECT
     Q_DISABLE_COPY(SearchJobWidget)
diff --git a/src/gui/search/searchlistdelegate.h b/src/gui/search/searchlistdelegate.h
index 7249df68b..430712b00 100644
--- a/src/gui/search/searchlistdelegate.h
+++ b/src/gui/search/searchlistdelegate.h
@@ -31,7 +31,7 @@
 
 #include <QItemDelegate>
 
-class SearchListDelegate : public QItemDelegate
+class SearchListDelegate final : public QItemDelegate
 {
     Q_OBJECT
 
diff --git a/src/gui/search/searchsortmodel.h b/src/gui/search/searchsortmodel.h
index 50f782c49..5c1e808d2 100644
--- a/src/gui/search/searchsortmodel.h
+++ b/src/gui/search/searchsortmodel.h
@@ -32,7 +32,7 @@
 #include <QSortFilterProxyModel>
 #include <QStringList>
 
-class SearchSortModel : public QSortFilterProxyModel
+class SearchSortModel final : public QSortFilterProxyModel
 {
     using base = QSortFilterProxyModel;
 
diff --git a/src/gui/shutdownconfirmdialog.h b/src/gui/shutdownconfirmdialog.h
index dfa3c7ffc..7cec60cc3 100644
--- a/src/gui/shutdownconfirmdialog.h
+++ b/src/gui/shutdownconfirmdialog.h
@@ -39,7 +39,7 @@ namespace Ui
     class ShutdownConfirmDialog;
 }
 
-class ShutdownConfirmDialog : public QDialog
+class ShutdownConfirmDialog final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/gui/tagfiltermodel.h b/src/gui/tagfiltermodel.h
index 1fe5a9004..0cfb4ce0f 100644
--- a/src/gui/tagfiltermodel.h
+++ b/src/gui/tagfiltermodel.h
@@ -42,7 +42,7 @@ namespace BitTorrent
     class TorrentHandle;
 }
 
-class TagFilterModel : public QAbstractListModel
+class TagFilterModel final : public QAbstractListModel
 {
     Q_OBJECT
 
diff --git a/src/gui/tagfilterproxymodel.h b/src/gui/tagfilterproxymodel.h
index 93b75b585..7e53bb492 100644
--- a/src/gui/tagfilterproxymodel.h
+++ b/src/gui/tagfilterproxymodel.h
@@ -33,7 +33,7 @@
 
 class QString;
 
-class TagFilterProxyModel : public QSortFilterProxyModel
+class TagFilterProxyModel final : public QSortFilterProxyModel
 {
 public:
     explicit TagFilterProxyModel(QObject *parent = nullptr);
diff --git a/src/gui/tagfilterwidget.h b/src/gui/tagfilterwidget.h
index a8e2a6ee8..4694b085c 100644
--- a/src/gui/tagfilterwidget.h
+++ b/src/gui/tagfilterwidget.h
@@ -31,7 +31,7 @@
 
 #include <QTreeView>
 
-class TagFilterWidget : public QTreeView
+class TagFilterWidget final : public QTreeView
 {
     Q_OBJECT
 
diff --git a/src/gui/torrentcontentfiltermodel.h b/src/gui/torrentcontentfiltermodel.h
index dff54304d..4bddc23bc 100644
--- a/src/gui/torrentcontentfiltermodel.h
+++ b/src/gui/torrentcontentfiltermodel.h
@@ -35,7 +35,7 @@
 
 class TorrentContentModel;
 
-class TorrentContentFilterModel : public QSortFilterProxyModel
+class TorrentContentFilterModel final : public QSortFilterProxyModel
 {
     Q_OBJECT
 
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 1b8dcd050..b8bdc46d4 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -82,7 +82,7 @@ namespace
     public:
         using QFileIconProvider::icon;
 
-        QIcon icon(const QFileInfo &info) const final override
+        QIcon icon(const QFileInfo &info) const final
         {
             const QString ext = info.suffix();
             if (!ext.isEmpty()) {
diff --git a/src/gui/torrentcontentmodel.h b/src/gui/torrentcontentmodel.h
index 60d2e30ab..779f82a4e 100644
--- a/src/gui/torrentcontentmodel.h
+++ b/src/gui/torrentcontentmodel.h
@@ -45,7 +45,7 @@ namespace BitTorrent
     class TorrentInfo;
 }
 
-class TorrentContentModel : public QAbstractItemModel
+class TorrentContentModel final : public QAbstractItemModel
 {
     Q_OBJECT
     Q_DISABLE_COPY(TorrentContentModel)
diff --git a/src/gui/torrentcontentmodelfile.h b/src/gui/torrentcontentmodelfile.h
index 61d663d82..fe0cc4797 100644
--- a/src/gui/torrentcontentmodelfile.h
+++ b/src/gui/torrentcontentmodelfile.h
@@ -36,7 +36,7 @@ namespace BitTorrent
     enum class DownloadPriority;
 }
 
-class TorrentContentModelFile : public TorrentContentModelItem
+class TorrentContentModelFile final : public TorrentContentModelItem
 {
 public:
     TorrentContentModelFile(const QString &fileName, qulonglong fileSize,
diff --git a/src/gui/torrentcontentmodelfolder.h b/src/gui/torrentcontentmodelfolder.h
index 55ec68075..a99f89999 100644
--- a/src/gui/torrentcontentmodelfolder.h
+++ b/src/gui/torrentcontentmodelfolder.h
@@ -36,7 +36,7 @@ namespace BitTorrent
     enum class DownloadPriority;
 }
 
-class TorrentContentModelFolder : public TorrentContentModelItem
+class TorrentContentModelFolder final : public TorrentContentModelItem
 {
 public:
     // Folder constructor
diff --git a/src/gui/torrentcontenttreeview.h b/src/gui/torrentcontenttreeview.h
index b44c395af..334030312 100644
--- a/src/gui/torrentcontenttreeview.h
+++ b/src/gui/torrentcontenttreeview.h
@@ -37,7 +37,7 @@ namespace BitTorrent
     class TorrentInfo;
 }
 
-class TorrentContentTreeView : public QTreeView
+class TorrentContentTreeView final : public QTreeView
 {
     Q_OBJECT
 
diff --git a/src/gui/torrentcreatordialog.h b/src/gui/torrentcreatordialog.h
index 3a7f145fd..b008056ab 100644
--- a/src/gui/torrentcreatordialog.h
+++ b/src/gui/torrentcreatordialog.h
@@ -44,7 +44,7 @@ namespace Ui
     class TorrentCreatorDialog;
 }
 
-class TorrentCreatorDialog : public QDialog
+class TorrentCreatorDialog final : public QDialog
 {
     Q_OBJECT
 
diff --git a/src/gui/transferlistdelegate.h b/src/gui/transferlistdelegate.h
index 0f819c7e4..2d5302cca 100644
--- a/src/gui/transferlistdelegate.h
+++ b/src/gui/transferlistdelegate.h
@@ -34,7 +34,7 @@ class QModelIndex;
 class QPainter;
 class QStyleOptionViewItem;
 
-class TransferListDelegate : public QStyledItemDelegate
+class TransferListDelegate final : public QStyledItemDelegate
 {
     Q_OBJECT
     Q_DISABLE_COPY(TransferListDelegate)
diff --git a/src/gui/transferlistfilterswidget.cpp b/src/gui/transferlistfilterswidget.cpp
index cf7ccf8fa..8f0094591 100644
--- a/src/gui/transferlistfilterswidget.cpp
+++ b/src/gui/transferlistfilterswidget.cpp
@@ -74,7 +74,7 @@ namespace
         return scheme;
     }
 
-    class ArrowCheckBox : public QCheckBox
+    class ArrowCheckBox final : public QCheckBox
     {
     public:
         using QCheckBox::QCheckBox;
diff --git a/src/gui/transferlistfilterswidget.h b/src/gui/transferlistfilterswidget.h
index 4d8c49564..3b0318989 100644
--- a/src/gui/transferlistfilterswidget.h
+++ b/src/gui/transferlistfilterswidget.h
@@ -72,7 +72,7 @@ private slots:
     virtual void torrentAboutToBeDeleted(BitTorrent::TorrentHandle *const) = 0;
 };
 
-class StatusFilterWidget : public BaseFilterWidget
+class StatusFilterWidget final : public BaseFilterWidget
 {
     Q_OBJECT
     Q_DISABLE_COPY(StatusFilterWidget)
@@ -93,7 +93,7 @@ private:
     void torrentAboutToBeDeleted(BitTorrent::TorrentHandle *const) override;
 };
 
-class TrackerFiltersList : public BaseFilterWidget
+class TrackerFiltersList final : public BaseFilterWidget
 {
     Q_OBJECT
     Q_DISABLE_COPY(TrackerFiltersList)
diff --git a/src/gui/transferlistmodel.h b/src/gui/transferlistmodel.h
index cfd84779f..8740aa727 100644
--- a/src/gui/transferlistmodel.h
+++ b/src/gui/transferlistmodel.h
@@ -41,7 +41,7 @@ namespace BitTorrent
     class InfoHash;
 }
 
-class TransferListModel : public QAbstractListModel
+class TransferListModel final : public QAbstractListModel
 {
     Q_OBJECT
     Q_DISABLE_COPY(TransferListModel)
diff --git a/src/gui/transferlistsortmodel.h b/src/gui/transferlistsortmodel.h
index 143f2583a..b8ea1336e 100644
--- a/src/gui/transferlistsortmodel.h
+++ b/src/gui/transferlistsortmodel.h
@@ -33,7 +33,7 @@
 
 class QStringList;
 
-class TransferListSortModel : public QSortFilterProxyModel
+class TransferListSortModel final : public QSortFilterProxyModel
 {
     Q_OBJECT
     Q_DISABLE_COPY(TransferListSortModel)
diff --git a/src/gui/transferlistwidget.h b/src/gui/transferlistwidget.h
index 7608b1612..889ae0d1c 100644
--- a/src/gui/transferlistwidget.h
+++ b/src/gui/transferlistwidget.h
@@ -43,7 +43,7 @@ namespace BitTorrent
     class TorrentHandle;
 }
 
-class TransferListWidget : public QTreeView
+class TransferListWidget final : public QTreeView
 {
     Q_OBJECT
 
diff --git a/src/gui/updownratiodialog.h b/src/gui/updownratiodialog.h
index 725b5d99e..a3d482585 100644
--- a/src/gui/updownratiodialog.h
+++ b/src/gui/updownratiodialog.h
@@ -36,7 +36,7 @@ namespace Ui
     class UpDownRatioDialog;
 }
 
-class UpDownRatioDialog : public QDialog
+class UpDownRatioDialog final : public QDialog
 {
     Q_OBJECT