diff --git a/bitfield/admin.py b/bitfield/admin.py
index 30f0cf0e..d1766d2e 100644
--- a/bitfield/admin.py
+++ b/bitfield/admin.py
@@ -23,7 +23,7 @@ def __init__(self, field, request, params, model, model_admin, field_path):
 
     def queryset(self, request, queryset):
         filter_kwargs = dict(
-            (p, BitHandler(v, ()))
+            (p, BitHandler(v, getattr(queryset.model, p)))
             for p, v in six.iteritems(self.used_parameters)
         )
         if not filter_kwargs: