diff --git a/scrapy/contrib_exp/djangoitem.py b/scrapy/contrib_exp/djangoitem.py
index dfef58dac..1abe98bfd 100644
--- a/scrapy/contrib_exp/djangoitem.py
+++ b/scrapy/contrib_exp/djangoitem.py
@@ -11,8 +11,7 @@ class DjangoItemMeta(ItemMeta):
             cls._model_fields = []
             cls._model_meta = cls.django_model._meta
             for model_field in cls._model_meta.fields:
-                # XXX: for now we're treating each PK as autogenerated field
-                if model_field != cls._model_meta.pk:
+                if model_field.auto_created == False:
                     if model_field.name not in cls.fields:
                         cls.fields[model_field.name] = Field()
                     cls._model_fields.append(model_field.name)
@@ -31,4 +30,3 @@ class DjangoItem(Item):
         if commit:
             model.save()
         return model
-