diff --git a/src/widgets/itemviews/qtreewidget.cpp b/src/widgets/itemviews/qtreewidget.cpp
index 748d899dd06..c824b5111f8 100644
--- a/src/widgets/itemviews/qtreewidget.cpp
+++ b/src/widgets/itemviews/qtreewidget.cpp
@@ -3342,14 +3342,25 @@ QList<QTreeWidgetItem*> QTreeWidget::items(const QMimeData *data) const
 /*!
     Returns the QModelIndex assocated with the given \a item in the given \a column.
 
+    \note In Qt versions prior to 5.7, this function took a non-\c{const} \a item.
+
     \sa itemFromIndex(), topLevelItem()
 */
-QModelIndex QTreeWidget::indexFromItem(QTreeWidgetItem *item, int column) const
+QModelIndex QTreeWidget::indexFromItem(const QTreeWidgetItem *item, int column) const
 {
     Q_D(const QTreeWidget);
     return d->index(item, column);
 }
 
+/*!
+    \overload
+    \internal
+*/
+QModelIndex QTreeWidget::indexFromItem(QTreeWidgetItem *item, int column) const
+{
+    return indexFromItem(const_cast<const QTreeWidgetItem *>(item), column);
+}
+
 /*!
     Returns a pointer to the QTreeWidgetItem assocated with the given \a index.
 
diff --git a/src/widgets/itemviews/qtreewidget.h b/src/widgets/itemviews/qtreewidget.h
index 995528fe375..e39593c6c13 100644
--- a/src/widgets/itemviews/qtreewidget.h
+++ b/src/widgets/itemviews/qtreewidget.h
@@ -350,7 +350,8 @@ protected:
     virtual Qt::DropActions supportedDropActions() const;
     QList<QTreeWidgetItem*> items(const QMimeData *data) const;
 
-    QModelIndex indexFromItem(QTreeWidgetItem *item, int column = 0) const;
+    QModelIndex indexFromItem(const QTreeWidgetItem *item, int column = 0) const;
+    QModelIndex indexFromItem(QTreeWidgetItem *item, int column = 0) const; // ### Qt 6: remove
     QTreeWidgetItem *itemFromIndex(const QModelIndex &index) const;
     void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;