diff --git a/src/blackcore/application.cpp b/src/blackcore/application.cpp
index abe79e4d6..aa653dd7c 100644
--- a/src/blackcore/application.cpp
+++ b/src/blackcore/application.cpp
@@ -255,13 +255,13 @@ namespace BlackCore
 
     const QString &CApplication::getApplicationNameAndVersion() const
     {
-        static const QString s(m_applicationName + " " + CBuildConfig::getVersionString());
+        static const QString s(m_applicationName % QStringLiteral(" ") % CBuildConfig::getVersionString());
         return s;
     }
 
     const QString &CApplication::getApplicationNameVersionDetailed() const
     {
-        static const QString s(m_applicationName + " " + this->versionStringDetailed());
+        static const QString s(m_applicationName % QStringLiteral(" ") % this->versionStringDetailed());
         return s;
     }
 
diff --git a/src/blackgui/guiapplication.h b/src/blackgui/guiapplication.h
index b1aa74b30..c7e37c0c0 100644
--- a/src/blackgui/guiapplication.h
+++ b/src/blackgui/guiapplication.h
@@ -86,7 +86,7 @@ namespace BlackGui
         CGuiApplication(const QString &applicationName = executable(), BlackMisc::CApplicationInfo::Application application = BlackMisc::CApplicationInfo::Unknown, const QPixmap &icon = BlackMisc::CIcons::swift64());
 
         //! Destructor
-        virtual ~CGuiApplication();
+        virtual ~CGuiApplication() override;
 
         //! CMD line arguments
         void addWindowStateOption();
diff --git a/src/blackgui/models/aircraftmodellistmodel.h b/src/blackgui/models/aircraftmodellistmodel.h
index c9fddf0b9..8be668889 100644
--- a/src/blackgui/models/aircraftmodellistmodel.h
+++ b/src/blackgui/models/aircraftmodellistmodel.h
@@ -22,7 +22,6 @@
 #include <Qt>
 
 class QModelIndex;
-class QObject;
 
 namespace BlackMisc { namespace Simulation { class CAircraftModel; } }
 namespace BlackGui
diff --git a/src/blackgui/plugindetailswindow.cpp b/src/blackgui/plugindetailswindow.cpp
index c8b48e5b7..54ab2b1e8 100644
--- a/src/blackgui/plugindetailswindow.cpp
+++ b/src/blackgui/plugindetailswindow.cpp
@@ -42,7 +42,7 @@ namespace BlackGui
     void CPluginDetailsWindow::setPluginName(const QString &name)
     {
         ui->lbl_PluginName->setText(name);
-        setWindowTitle(name);
+        this->setWindowTitle(name);
     }
 
     void CPluginDetailsWindow::setPluginIdentifier(const QString &id)
diff --git a/src/blackgui/plugindetailswindow.h b/src/blackgui/plugindetailswindow.h
index 2b9b9ba0b..7211e7655 100644
--- a/src/blackgui/plugindetailswindow.h
+++ b/src/blackgui/plugindetailswindow.h
@@ -22,7 +22,6 @@
 class QShowEvent;
 
 namespace Ui { class CPluginDetailsWindow; }
-
 namespace BlackGui
 {
     /*!
@@ -37,7 +36,7 @@ namespace BlackGui
         explicit CPluginDetailsWindow(QWidget *parent = nullptr);
 
         //! Destructor
-        virtual ~CPluginDetailsWindow();
+        virtual ~CPluginDetailsWindow() override;
 
         //! Sets the plugin name
         void setPluginName(const QString &name);
diff --git a/src/swiftdata/swiftdata.cpp b/src/swiftdata/swiftdata.cpp
index cb2e20dbf..65157963a 100644
--- a/src/swiftdata/swiftdata.cpp
+++ b/src/swiftdata/swiftdata.cpp
@@ -111,7 +111,7 @@ void CSwiftData::init()
     const CGlobalSetup s(sApp->getGlobalSetup());
     if (!s.getDbHomePageUrl().isEmpty())
     {
-        this->setWindowTitle(QString("%1 %2").arg(this->windowTitle(), s.getDbHomePageUrl().toQString(true)));
+        this->setWindowTitle(QStringLiteral("%1 %2").arg(this->windowTitle(), s.getDbHomePageUrl().toQString(true)));
     }
 
     sGui->triggerNewVersionCheck(15 * 1000);