diff --git a/jpype/protocol.py b/jpype/protocol.py
index <HASH>..<HASH> 100644
--- a/jpype/protocol.py
+++ b/jpype/protocol.py
@@ -49,7 +49,7 @@ else:
     # 3.8 onward
     from typing import Protocol, runtime_checkable
     from typing import SupportsIndex, SupportsFloat  # lgtm [py/unused-import]
-    from typing import Sequence, Mapping, Callable  # lgtm [py/unused-import]
+    from typing import Sequence, Mapping, Set, Callable  # lgtm [py/unused-import]
 
 # Types we need
Add Set for older python versions