diff --git a/alyx/data/serializers.py b/alyx/data/serializers.py
index a10f02f5..c455611f 100644
--- a/alyx/data/serializers.py
+++ b/alyx/data/serializers.py
@@ -220,7 +220,7 @@ class Meta:
                   'session', 'file_size', 'hash', 'version',
                   'experiment_number', 'file_records',
                   'subject', 'date', 'number', 'auto_datetime', 'revision',
-                  'default_dataset', 'protected', 'public', 'tags', 'qc')
+                  'default_dataset', 'protected', 'public', 'tags', 'qc', 'json')
         extra_kwargs = {
             'subject': {'write_only': True},
             'date': {'write_only': True},
diff --git a/alyx/data/transfers.py b/alyx/data/transfers.py
index 3cc730ab..bc6b744e 100644
--- a/alyx/data/transfers.py
+++ b/alyx/data/transfers.py
@@ -11,7 +11,6 @@
 import numpy as np
 from one.alf.files import add_uuid_string, folder_parts
 from one.registration import get_dataset_type
-from one.util import ensure_list
 from one.alf.spec import QC
 
 from alyx import settings
diff --git a/setup.cfg b/setup.cfg
index ca0902f7..d332421a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,7 @@ universal = 1
 [tool:pytest]
 
 [flake8]
-ignore = E117,E265,E731,F403,E741,E722,W504
+ignore = E117,E265,E731,F403,E741,E722,W504,D
 max-line-length = 99
 exclude = migrations