diff --git a/xarray/backends/api.py b/xarray/backends/api.py
index 93819d35bb8..d7aa0bde0a5 100644
--- a/xarray/backends/api.py
+++ b/xarray/backends/api.py
@@ -2,7 +2,6 @@
 
 import os
 from collections.abc import Hashable, Iterable, Mapping, MutableMapping, Sequence
-from typing import Optional
 from functools import partial
 from io import BytesIO
 from numbers import Number
@@ -12,6 +11,7 @@
     Callable,
     Final,
     Literal,
+    Optional,
     Union,
     cast,
     overload,