diff --git a/datetimewidget/widgets.py b/datetimewidget/widgets.py
index b159c31..58c90b3 100644
--- a/datetimewidget/widgets.py
+++ b/datetimewidget/widgets.py
@@ -219,7 +219,7 @@ def __init__(self, attrs=None, options=None, usel10n=None, bootstrap_version=Non
 
         super(PickerWidgetMixin, self).__init__(attrs, format=self.format)
 
-    def render(self, name, value, attrs=None):
+    def render(self, name, value, attrs=None, renderer=None):
         final_attrs = self.build_attrs(attrs)
         rendered_widget = super(PickerWidgetMixin, self).render(name, value, final_attrs)