diff --git a/src/widgets/widgets/qdockarealayout.cpp b/src/widgets/widgets/qdockarealayout.cpp
index c4de04a6765..e0d8995bf83 100644
--- a/src/widgets/widgets/qdockarealayout.cpp
+++ b/src/widgets/widgets/qdockarealayout.cpp
@@ -1474,7 +1474,7 @@ QList<int> QDockAreaLayoutInfo::indexOfPlaceHolder(const QString &objectName) co
     return QList<int>();
 }
 
-QList<int> QDockAreaLayoutInfo::indexOf(QWidget *widget) const
+QList<int> QDockAreaLayoutInfo::indexOf(const QWidget *widget) const
 {
     for (int i = 0; i < item_list.size(); ++i) {
         const QDockAreaLayoutItem &item = item_list.at(i);
@@ -2458,7 +2458,7 @@ QList<int> QDockAreaLayout::indexOfPlaceHolder(const QString &objectName) const
     return QList<int>();
 }
 
-QList<int> QDockAreaLayout::indexOf(QWidget *dockWidget) const
+QList<int> QDockAreaLayout::indexOf(const QWidget *dockWidget) const
 {
     for (int i = 0; i < QInternal::DockCount; ++i) {
         QList<int> result = docks[i].indexOf(dockWidget);
diff --git a/src/widgets/widgets/qdockarealayout_p.h b/src/widgets/widgets/qdockarealayout_p.h
index aa39bf9913c..ca9f4b656f0 100644
--- a/src/widgets/widgets/qdockarealayout_p.h
+++ b/src/widgets/widgets/qdockarealayout_p.h
@@ -143,7 +143,7 @@ public:
     int next(int idx) const;
     int prev(int idx) const;
 
-    QList<int> indexOf(QWidget *widget) const;
+    QList<int> indexOf(const QWidget *widget) const;
     QList<int> indexOfPlaceHolder(const QString &objectName) const;
 
     QDockWidget *apply(bool animate);
@@ -217,7 +217,7 @@ public:
     bool restoreState(QDataStream &stream, const QList<QDockWidget*> &widgets, bool testing = false);
 
     QList<int> indexOfPlaceHolder(const QString &objectName) const;
-    QList<int> indexOf(QWidget *dockWidget) const;
+    QList<int> indexOf(const QWidget *dockWidget) const;
     QList<int> gapIndex(const QPoint &pos, bool disallowTabs) const;
     QList<int> findSeparator(const QPoint &pos) const;
 
diff --git a/src/widgets/widgets/qmainwindowlayout.cpp b/src/widgets/widgets/qmainwindowlayout.cpp
index 3bec3a3c917..c72ae0b539d 100644
--- a/src/widgets/widgets/qmainwindowlayout.cpp
+++ b/src/widgets/widgets/qmainwindowlayout.cpp
@@ -1868,7 +1868,7 @@ void QMainWindowLayout::splitDockWidget(QDockWidget *after,
     invalidate();
 }
 
-Qt::DockWidgetArea QMainWindowLayout::dockWidgetArea(QWidget *widget) const
+Qt::DockWidgetArea QMainWindowLayout::dockWidgetArea(const QWidget *widget) const
 {
     const QList<int> pathToWidget = layoutState.dockAreaLayout.indexOf(widget);
     if (pathToWidget.isEmpty())
diff --git a/src/widgets/widgets/qmainwindowlayout_p.h b/src/widgets/widgets/qmainwindowlayout_p.h
index f4211046e1c..e2770fd58d5 100644
--- a/src/widgets/widgets/qmainwindowlayout_p.h
+++ b/src/widgets/widgets/qmainwindowlayout_p.h
@@ -537,7 +537,7 @@ public:
     void splitDockWidget(QDockWidget *after,
                          QDockWidget *dockwidget,
                          Qt::Orientation orientation);
-    Qt::DockWidgetArea dockWidgetArea(QWidget* widget) const;
+    Qt::DockWidgetArea dockWidgetArea(const QWidget* widget) const;
     bool restoreDockWidget(QDockWidget *dockwidget);
 #if QT_CONFIG(tabbar)
     void tabifyDockWidget(QDockWidget *first, QDockWidget *second);