diff --git a/product/ERP5Form/FormulatorPatch.py b/product/ERP5Form/FormulatorPatch.py
index a513ce989214e1d6434fdf6a5f2108b4c17da955..5a5655e58631a67a6d9f320444e8d6c6535a262a 100755
--- a/product/ERP5Form/FormulatorPatch.py
+++ b/product/ERP5Form/FormulatorPatch.py
@@ -624,5 +624,6 @@ class PatchedDateTimeWidget(DateTimeWidget):
         else:
             return date_result
         
-DateTimeWidget.render = PatchedDateTimeWidget.render      
+PatchedDateTimeWidgetInstance = PatchedDateTimeWidget()
+DateTimeField.widget = PatchedDateTimeWidgetInstance