diff --git a/arkindex_worker/worker/classification.py b/arkindex_worker/worker/classification.py
index 026f107f60805b91f0b7aa753090f54cad39f8b4..7e857e98743897ffc01bf15533a0ab56e4dfb86b 100644
--- a/arkindex_worker/worker/classification.py
+++ b/arkindex_worker/worker/classification.py
@@ -2,7 +2,6 @@
 ElementsWorker methods for classifications and ML classes.
 """
 
-
 from apistar.exceptions import ErrorResponse
 from peewee import IntegrityError