diff --git a/include/wx/dataview.h b/include/wx/dataview.h
index b1229375ad..b9bc7320d0 100644
--- a/include/wx/dataview.h
+++ b/include/wx/dataview.h
@@ -951,7 +951,7 @@ public:
         { return (const wxDataViewListStore*) GetModel(); }
 
     int ItemToRow(const wxDataViewItem &item) const
-        { return item.IsOk() ? GetStore()->GetRow(item) : wxNOT_FOUND; }
+        { return item.IsOk() ? (int)GetStore()->GetRow(item) : wxNOT_FOUND; }
     wxDataViewItem RowToItem(int row) const
         { return row == wxNOT_FOUND ? wxDataViewItem() : GetStore()->GetItem(row); }