diff --git a/sigi/test_testutils.py b/sigi/test_testutils.py
index 0ec9969..7b75ec4 100644
--- a/sigi/test_testutils.py
+++ b/sigi/test_testutils.py
@@ -1,10 +1,9 @@
-from sigi.testutils import SigiDataFixture
+from collections import namedtuple
 
+from sigi.testutils import SigiDataFixture
 
-class FieldStub(object):
 
-    def __init__(self, max_length):
-        self.max_length = max_length
+FieldStub = namedtuple('FieldStub', ['max_length'])
 
 
 def test_sigidatafixture():