diff --git a/src/corelib/itemmodels/qabstractproxymodel.cpp b/src/corelib/itemmodels/qabstractproxymodel.cpp
index 9b8c11af12..cdf811e29b 100644
--- a/src/corelib/itemmodels/qabstractproxymodel.cpp
+++ b/src/corelib/itemmodels/qabstractproxymodel.cpp
@@ -366,7 +366,7 @@ bool QAbstractProxyModel::hasChildren(const QModelIndex &parent) const
 QModelIndex QAbstractProxyModel::sibling(int row, int column, const QModelIndex &idx) const
 {
     Q_D(const QAbstractProxyModel);
-    return d->model->sibling(row, column, mapToSource(idx));
+    return mapFromSource(d->model->sibling(row, column, mapToSource(idx)));
 }
 
 /*!