diff --git a/mwdb/model/blob.py b/mwdb/model/blob.py
index 069e013b7..cf094e63b 100644
--- a/mwdb/model/blob.py
+++ b/mwdb/model/blob.py
@@ -5,7 +5,6 @@
 from sqlalchemy.ext.hybrid import hybrid_property
 
 from mwdb.core.karton import send_blob_to_karton
-from mwdb.model import attribute
 
 from . import db
 from .object import Object