diff --git a/attic/archive.py b/attic/archive.py
index f5726ea27..68acf866c 100644
--- a/attic/archive.py
+++ b/attic/archive.py
@@ -17,7 +17,7 @@ from attic import xattr
 from attic.platform import acl_get, acl_set
 from attic.chunker import Chunker
 from attic.hashindex import ChunkIndex
-from attic.helpers import Error, uid2user, user2uid, gid2group, group2gid, \
+from attic.helpers import parse_timestamp, Error, uid2user, user2uid, gid2group, group2gid, \
     Manifest, Statistics, decode_dict, st_mtime_ns, make_path_safe, StableDict, int_to_bigint, bigint_to_int
 
 ITEMS_BUFFER = 1024 * 1024