diff --git a/src/borg/archiver.py b/src/borg/archiver.py
index 1a46e4350..c92ba7e05 100644
--- a/src/borg/archiver.py
+++ b/src/borg/archiver.py
@@ -1356,7 +1356,7 @@ def item_to_tarinfo(item, original_path):
             tarinfo.uid = item.uid
             tarinfo.gid = item.gid
             tarinfo.uname = item.get('user', '')
-            tarinfo.gname = item.get('group',  '')
+            tarinfo.gname = item.get('group', '')
             # The linkname in tar has 2 uses:
             # for symlinks it means the destination, while for hardlinks it refers to the file.
             # Since hardlinks in tar have a different type code (LNKTYPE) the format might
diff --git a/src/borg/cache.py b/src/borg/cache.py
index 784910673..d5d87f74d 100644
--- a/src/borg/cache.py
+++ b/src/borg/cache.py
@@ -1,5 +1,4 @@
 import configparser
-import json
 import os
 import shutil
 import stat
@@ -655,8 +654,6 @@ def sync(self):
         archive indexes.
         """
         archive_path = os.path.join(self.path, 'chunks.archive.d')
-        # An index of chunks whose size had to be fetched
-        chunks_fetched_size_index = ChunkIndex()
         # Instrumentation
         processed_item_metadata_bytes = 0
         processed_item_metadata_chunks = 0