diff --git a/chrono/manager/widgets.py b/chrono/manager/widgets.py
index e7247628..f3387c01 100644
--- a/chrono/manager/widgets.py
+++ b/chrono/manager/widgets.py
@@ -83,9 +83,9 @@ class PickerWidgetMixin(object):
 
         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)
+        rendered_widget = super(PickerWidgetMixin, self).render(name, value, final_attrs, renderer=renderer)
 
         #if not set, autoclose have to be true.
         self.options.setdefault('autoclose', True)
@@ -145,7 +145,7 @@ class TimeWidget(TimeInput):
 
 
 class WeekdaysWidget(SelectMultiple):
-    def render(self, name, value, attrs=None, choices=()):
+    def render(self, name, value, attrs=None, choices=(), renderer=None):
         s = []
         value = value or []
         for choice_id, choice_label in self.choices: