diff --git a/samples/dataview/mymodels.cpp b/samples/dataview/mymodels.cpp
index e00ba68099..e6ee751299 100644
--- a/samples/dataview/mymodels.cpp
+++ b/samples/dataview/mymodels.cpp
@@ -591,7 +591,7 @@ bool MyListModel::SetValueByRow( const wxVariant &variant,
             {
                 // the item is not in the range of the items
                 // which we store... for simplicity, don't allow editing it
-                wxLogError( "Cannot edit rows with an index greater than %d",
+                wxLogError( "Cannot edit rows with an index greater than %zu",
                             m_textColValues.GetCount() );
                 return false;
             }