Index: /home/david/Workspace/fairford/src/django/core/serializers/python.py
===================================================================
--- /home/david/Workspace/fairford/src/django/core/serializers/python.py	(revision 9244)
+++ /home/david/Workspace/fairford/src/django/core/serializers/python.py	(working copy)
@@ -45,7 +45,7 @@
                 related = related._get_pk_val()
             else:
                 # Related to remote object via other field
-                related = getattr(related, field.rel.field_name)
+                related = getattr(related, field.rel.get_related_field().attname)
         self._current[field.name] = smart_unicode(related, strings_only=True)
 
     def handle_m2m_field(self, obj, field):
Index: /home/david/Workspace/fairford/src/django/core/serializers/xml_serializer.py
===================================================================
--- /home/david/Workspace/fairford/src/django/core/serializers/xml_serializer.py	(revision 9244)
+++ /home/david/Workspace/fairford/src/django/core/serializers/xml_serializer.py	(working copy)
@@ -88,7 +88,7 @@
                 related = related._get_pk_val()
             else:
                 # Related to remote object via other field
-                related = getattr(related, field.rel.field_name)
+                related = getattr(related, field.rel.get_related_field().attname)
             self.xml.characters(smart_unicode(related))
         else:
             self.xml.addQuickElement("None")