diff --git a/datacube/cfg/opt.py b/datacube/cfg/opt.py
index eccb28d67..780f66c6d 100644
--- a/datacube/cfg/opt.py
+++ b/datacube/cfg/opt.py
@@ -5,7 +5,6 @@
 
 import os
 import warnings
-from itertools import chain
 from typing import Any, TYPE_CHECKING
 from urllib.parse import urlparse