diff --git a/requests/structures.py b/requests/structures.py
index 05d2b3f57b..fc4b64ef2c 100644
--- a/requests/structures.py
+++ b/requests/structures.py
@@ -9,6 +9,8 @@
 
 import collections
 
+from typing import List
+
 from .compat import OrderedDict