diff --git a/s3contents/genericmanager.py b/s3contents/genericmanager.py
index d690b6a..af279e9 100644
--- a/s3contents/genericmanager.py
+++ b/s3contents/genericmanager.py
@@ -5,6 +5,12 @@
 
 from tornado.web import HTTPError
 
+from s3contents.chunks import (
+    CHUNKS_HANDLING,
+    assemble_chunks,
+    delete_chunks,
+    store_content_chunk,
+)
 from s3contents.genericfs import GenericFSError, NoSuchFile
 from s3contents.ipycompat import (
     ContentsManager,
@@ -14,12 +20,6 @@
     from_dict,
     reads,
 )
-from s3contents.chunks import (
-    CHUNKS_HANDLING,
-    assemble_chunks,
-    delete_chunks,
-    store_content_chunk,
-)
 
 
 DUMMY_CREATED_DATE = datetime.datetime.fromtimestamp(86400)