diff --git a/dist/changes-5.2.0 b/dist/changes-5.2.0
index ae0d785aab5..b0446fbbaf5 100644
--- a/dist/changes-5.2.0
+++ b/dist/changes-5.2.0
@@ -34,8 +34,12 @@ QtWidgets
 ---------
 
 - QAbstractScrollArea now has a SizeAdjustPolicy. If it is set to AdjustToContents
-  it will make use of the new protected viewportSizeHint() (binary compatible since it
-  was reserved in Qt5). This function returns a suggested size based on contents.
+  it will make use of the protected viewportSizeHint() virtual function. This
+  function returns a suggested size based on contents. Note that although the
+  viewportSizeHint() virtual function was reserved in 5.0, user code was not
+  supposed to be overriding it (as the function was private and undocumented).
+  Code that was overriding viewportSizeHint() needs to be recompiled against 5.2
+  for this feature to work correctly.
 
 - QTreeView now has setTreePosition to allow the treestructure to show data from other
   columns than logicalindex zero.
diff --git a/src/widgets/itemviews/qabstractitemview.cpp b/src/widgets/itemviews/qabstractitemview.cpp
index fd704e479b2..7edad74f54c 100644
--- a/src/widgets/itemviews/qabstractitemview.cpp
+++ b/src/widgets/itemviews/qabstractitemview.cpp
@@ -1390,6 +1390,15 @@ bool QAbstractItemView::showDropIndicator() const
     return d->showDropIndicator;
 }
 
+/*!
+    \since 5.2
+    \reimp
+*/
+QSize QAbstractItemView::viewportSizeHint() const
+{
+    return QAbstractScrollArea::viewportSizeHint();
+}
+
 /*!
     \property QAbstractItemView::dragEnabled
     \brief whether the view supports dragging of its own items
diff --git a/src/widgets/itemviews/qabstractitemview.h b/src/widgets/itemviews/qabstractitemview.h
index 96428515aeb..4f9cd7b1c64 100644
--- a/src/widgets/itemviews/qabstractitemview.h
+++ b/src/widgets/itemviews/qabstractitemview.h
@@ -346,6 +346,8 @@ protected:
     DropIndicatorPosition dropIndicatorPosition() const;
 #endif
 
+    QSize viewportSizeHint() const Q_DECL_OVERRIDE;
+
 private:
     Q_DECLARE_PRIVATE(QAbstractItemView)
     Q_DISABLE_COPY(QAbstractItemView)
diff --git a/src/widgets/itemviews/qlistview.cpp b/src/widgets/itemviews/qlistview.cpp
index 616a832b888..0cca52daa2a 100644
--- a/src/widgets/itemviews/qlistview.cpp
+++ b/src/widgets/itemviews/qlistview.cpp
@@ -3200,6 +3200,16 @@ int QListView::visualIndex(const QModelIndex &index) const
     return visualIndex;
 }
 
+
+/*!
+    \since 5.2
+    \reimp
+*/
+QSize QListView::viewportSizeHint() const
+{
+    return QAbstractItemView::viewportSizeHint();
+}
+
 QT_END_NAMESPACE
 
 #endif // QT_NO_LISTVIEW
diff --git a/src/widgets/itemviews/qlistview.h b/src/widgets/itemviews/qlistview.h
index e4ae2d03fdd..a973dfb2219 100644
--- a/src/widgets/itemviews/qlistview.h
+++ b/src/widgets/itemviews/qlistview.h
@@ -180,6 +180,8 @@ protected:
     void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
     void currentChanged(const QModelIndex &current, const QModelIndex &previous);
 
+    QSize viewportSizeHint() const Q_DECL_OVERRIDE;
+
 private:
     int visualIndex(const QModelIndex &index) const;
 
diff --git a/src/widgets/itemviews/qtableview.h b/src/widgets/itemviews/qtableview.h
index db956480d6a..387d24c6084 100644
--- a/src/widgets/itemviews/qtableview.h
+++ b/src/widgets/itemviews/qtableview.h
@@ -118,8 +118,6 @@ public:
 
     void sortByColumn(int column, Qt::SortOrder order);
 
-    QSize viewportSizeHint() const;
-
 public Q_SLOTS:
     void selectRow(int row);
     void selectColumn(int column);
@@ -161,6 +159,8 @@ protected:
 
     void updateGeometries();
 
+    QSize viewportSizeHint() const Q_DECL_OVERRIDE;
+
     int sizeHintForRow(int row) const;
     int sizeHintForColumn(int column) const;
 
diff --git a/src/widgets/itemviews/qtreeview.h b/src/widgets/itemviews/qtreeview.h
index d9c6cd92691..429b9d3add3 100644
--- a/src/widgets/itemviews/qtreeview.h
+++ b/src/widgets/itemviews/qtreeview.h
@@ -147,8 +147,6 @@ public:
     void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>());
     void selectAll();
 
-    QSize viewportSizeHint() const;
-
 Q_SIGNALS:
     void expanded(const QModelIndex &index);
     void collapsed(const QModelIndex &index);
@@ -208,6 +206,8 @@ protected:
 
     void updateGeometries();
 
+    QSize viewportSizeHint() const Q_DECL_OVERRIDE;
+
     int sizeHintForColumn(int column) const;
     int indexRowSizeHint(const QModelIndex &index) const;
     int rowHeight(const QModelIndex &index) const;
diff --git a/src/widgets/widgets/qscrollarea.h b/src/widgets/widgets/qscrollarea.h
index 70af5fbbd79..db1083f122b 100644
--- a/src/widgets/widgets/qscrollarea.h
+++ b/src/widgets/widgets/qscrollarea.h
@@ -69,7 +69,6 @@ public:
     void setWidgetResizable(bool resizable);
 
     QSize sizeHint() const;
-    QSize viewportSizeHint() const;
 
     bool focusNextPrevChild(bool next);
 
@@ -86,6 +85,8 @@ protected:
     void resizeEvent(QResizeEvent *);
     void scrollContentsBy(int dx, int dy);
 
+    QSize viewportSizeHint() const Q_DECL_OVERRIDE;
+
 private:
     Q_DECLARE_PRIVATE(QScrollArea)
     Q_DISABLE_COPY(QScrollArea)