Index: django/contrib/admin/views/main.py
===================================================================
--- django/contrib/admin/views/main.py	(revision 4528)
+++ django/contrib/admin/views/main.py	(working copy)
@@ -573,7 +573,7 @@
 
     def get_filters(self, request):
         filter_specs = []
-        if self.lookup_opts.admin.list_filter and not self.opts.one_to_one_field:
+        if self.lookup_opts.admin.list_filter: # and not self.opts.one_to_one_field:
             filter_fields = [self.lookup_opts.get_field(field_name) \
                               for field_name in self.lookup_opts.admin.list_filter]
             for f in filter_fields: