diff --git a/api/preprints/views.py b/api/preprints/views.py
index 8b72bef4ca7..ea6f359b0f2 100644
--- a/api/preprints/views.py
+++ b/api/preprints/views.py
@@ -208,7 +208,7 @@ def perform_update(self, serializer):
                 action=PreprintLog.FILE_UPDATED,
                 params={
                     'preprint': instance._id,
-                    'file': instance.primary_file._id
+                    'file': instance.primary_file._id,
                 },
                 auth=auth,
             )