diff --git a/examples/dockindock/perspectives.cpp b/examples/dockindock/perspectives.cpp
index 3ba3664..f5aa026 100644
--- a/examples/dockindock/perspectives.cpp
+++ b/examples/dockindock/perspectives.cpp
@@ -106,7 +106,7 @@ void PerspectivesManager::openPerspective( const QString& name, DockInDockWidget
                 curGroups = widget.getManager()->allManagers(false,true);
                 for ( auto curgroup : curGroups )
                 {
-                    if ( !m_perspectives[name].groups.keys().contains( curgroup->getPersistGroupName() ) )
+                    if ( !m_perspectives[name].groups.contains( curgroup->getPersistGroupName() ) )
                     {
                         widget.destroyGroup( &curgroup->parent() );
                     }
diff --git a/src/DockAreaWidget.cpp b/src/DockAreaWidget.cpp
index 90d21e9..26d24cc 100644
--- a/src/DockAreaWidget.cpp
+++ b/src/DockAreaWidget.cpp
@@ -1000,12 +1000,12 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 //============================================================================
 bool CDockAreaWidget::isCentralWidgetArea() const
 {
-    if (dockWidgetsCount()!= 1)
+    if (dockWidgetsCount() != 1)
     {
         return false;
     }
 
-    return dockManager()->centralWidget() == dockWidgets()[0];
+    return dockManager()->centralWidget() == dockWidgets().constFirst();
 }
 
 
diff --git a/src/DockContainerWidget.cpp b/src/DockContainerWidget.cpp
index 1d2539a..979e5ef 100644
--- a/src/DockContainerWidget.cpp
+++ b/src/DockContainerWidget.cpp
@@ -568,7 +568,6 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 	}
 	else
 	{
-		QList<int> NewSplitterSizes;
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
 		bool AdjustSplitterSizes = true;
@@ -692,7 +691,6 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 	}
 	else
 	{
-		auto Sizes = TargetAreaSplitter->sizes();
 		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		NewSplitter->addWidget(TargetArea);