diff --git a/select2/fields.py b/select2/fields.py
index 144976a..2ad68e3 100644
--- a/select2/fields.py
+++ b/select2/fields.py
@@ -133,13 +133,12 @@ def __init__(self, search_field=None, case_sensitive=False, *args, **kwargs):
         self.choice_iterator_cls = kwargs.pop('choice_iterator_cls', self.choice_iterator_cls)
         super(Select2ModelFieldMixin, self).__init__(*args, **kwargs)
 
-    def _get_choices(self):
+    @Select2FieldMixin.choices.getter
+    def choices(self):
         if hasattr(self, '_choices'):
             return self._choices
         return self.choice_iterator_cls(self)
 
-    choices = property(_get_choices, forms.ChoiceField._set_choices)
-
 
 class ModelChoiceField(Select2ModelFieldMixin, forms.ModelChoiceField):