--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -34,7 +34,7 @@ def pickler(request):
     return request.param
 
 
-@fixture(params=[pickle.loads, cPickle.loads])
+@fixture(params=[pickle.loads, cPickle.loads], ids=['pickle', 'cPickle'])
 def unpickler(request):
     return request.param