diff --git a/src/widgets/itemviews/qtreewidget.cpp b/src/widgets/itemviews/qtreewidget.cpp
index f8e3a375a4..6ee77c773d 100644
--- a/src/widgets/itemviews/qtreewidget.cpp
+++ b/src/widgets/itemviews/qtreewidget.cpp
@@ -2654,16 +2654,6 @@ QTreeWidgetItem *QTreeWidget::takeTopLevelItem(int index)
     return d->treeModel()->rootItem->takeChild(index);
 }
 
-/*!
-    \internal
-*/
-int QTreeWidget::indexOfTopLevelItem(QTreeWidgetItem *item)
-{
-    Q_D(QTreeWidget);
-    d->treeModel()->executePendingSort();
-    return d->treeModel()->rootItem->children.indexOf(item);
-}
-
 /*!
   Returns the index of the given top-level \a item, or -1 if the item
   cannot be found.
diff --git a/src/widgets/itemviews/qtreewidget.h b/src/widgets/itemviews/qtreewidget.h
index c5f1032728..611516cf99 100644
--- a/src/widgets/itemviews/qtreewidget.h
+++ b/src/widgets/itemviews/qtreewidget.h
@@ -277,7 +277,6 @@ public:
     void insertTopLevelItem(int index, QTreeWidgetItem *item);
     void addTopLevelItem(QTreeWidgetItem *item);
     QTreeWidgetItem *takeTopLevelItem(int index);
-    int indexOfTopLevelItem(QTreeWidgetItem *item); // ### Qt 5: remove me
     int indexOfTopLevelItem(QTreeWidgetItem *item) const;
 
     void insertTopLevelItems(int index, const QList<QTreeWidgetItem*> &items);