diff --git a/src/base/iconprovider.h b/src/base/iconprovider.h
index 35ba113ed..ea272c51d 100644
--- a/src/base/iconprovider.h
+++ b/src/base/iconprovider.h
@@ -35,7 +35,7 @@
 
 class QString;
 
-class IconProvider : public QObject
+class IconProvider final : public QObject
 {
     Q_DISABLE_COPY_MOVE(IconProvider)
 
diff --git a/src/base/logger.h b/src/base/logger.h
index 39aa8afb1..e41139f77 100644
--- a/src/base/logger.h
+++ b/src/base/logger.h
@@ -69,7 +69,7 @@ namespace Log
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(Log::MsgTypes)
 
-class Logger : public QObject
+class Logger final : public QObject
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(Logger)
diff --git a/src/base/net/downloadmanager.h b/src/base/net/downloadmanager.h
index aeb2b4887..faf636ba6 100644
--- a/src/base/net/downloadmanager.h
+++ b/src/base/net/downloadmanager.h
@@ -126,7 +126,7 @@ namespace Net
 
     class DownloadHandlerImpl;
 
-    class DownloadManager : public QObject
+    class DownloadManager final : public QObject
     {
         Q_OBJECT
         Q_DISABLE_COPY_MOVE(DownloadManager)
diff --git a/src/base/net/geoipmanager.h b/src/base/net/geoipmanager.h
index a5652d5f5..437459fdc 100644
--- a/src/base/net/geoipmanager.h
+++ b/src/base/net/geoipmanager.h
@@ -40,7 +40,7 @@ namespace Net
 {
     struct DownloadResult;
 
-    class GeoIPManager : public QObject
+    class GeoIPManager final : public QObject
     {
         Q_OBJECT
         Q_DISABLE_COPY_MOVE(GeoIPManager)
diff --git a/src/base/preferences.h b/src/base/preferences.h
index 60463399c..b3539b781 100644
--- a/src/base/preferences.h
+++ b/src/base/preferences.h
@@ -86,7 +86,7 @@ namespace TrayIcon
     Q_ENUM_NS(Style)
 }
 
-class Preferences : public QObject
+class Preferences final : public QObject
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(Preferences)
diff --git a/src/base/rss/rss_session.h b/src/base/rss/rss_session.h
index 550ff9a99..79c920066 100644
--- a/src/base/rss/rss_session.h
+++ b/src/base/rss/rss_session.h
@@ -88,7 +88,7 @@ namespace RSS
     class Folder;
     class Item;
 
-    class Session : public QObject
+    class Session final : public QObject
     {
         Q_OBJECT
         Q_DISABLE_COPY_MOVE(Session)
diff --git a/src/base/search/searchpluginmanager.h b/src/base/search/searchpluginmanager.h
index 35ec0cf18..86038ad66 100644
--- a/src/base/search/searchpluginmanager.h
+++ b/src/base/search/searchpluginmanager.h
@@ -58,7 +58,7 @@ struct PluginInfo
 class SearchDownloadHandler;
 class SearchHandler;
 
-class SearchPluginManager : public QObject
+class SearchPluginManager final : public QObject
 {
     Q_OBJECT
     Q_DISABLE_COPY_MOVE(SearchPluginManager)