diff --git a/src/aiida/storage/sqlite_zip/utils.py b/src/aiida/storage/sqlite_zip/utils.py
index c2a2a0ace2..a641a0195f 100644
--- a/src/aiida/storage/sqlite_zip/utils.py
+++ b/src/aiida/storage/sqlite_zip/utils.py
@@ -12,7 +12,6 @@
 import zipfile
 from pathlib import Path
 from typing import Any, Dict, Optional, Union
-from collections import deque
 
 from sqlalchemy import event
 from sqlalchemy.future.engine import Engine, create_engine