diff --git a/src/corelib/doc/snippets/code/src_gui_itemviews_qidentityproxymodel.cpp b/src/corelib/doc/snippets/code/src_gui_itemviews_qidentityproxymodel.cpp
index cf4707cbeb..d8939bf533 100644
--- a/src/corelib/doc/snippets/code/src_gui_itemviews_qidentityproxymodel.cpp
+++ b/src/corelib/doc/snippets/code/src_gui_itemviews_qidentityproxymodel.cpp
@@ -48,7 +48,7 @@ class DateFormatProxyModel : public QIdentityProxyModel
     m_formatString = formatString;
   }
 
-  QVariant data(const QModelIndex &index, int role)
+  QVariant data(const QModelIndex &index, int role) const
   {
     if (role != Qt::DisplayRole)
       return QIdentityProxyModel::data(index, role);