diff --git a/tests/unit/test_broadcast_claim.py b/tests/unit/test_broadcast_claim.py
index f8239b1..1c7784a 100644
--- a/tests/unit/test_broadcast_claim.py
+++ b/tests/unit/test_broadcast_claim.py
@@ -26,8 +26,8 @@ def _make_minimal_ticker() -> MagicMock:
 
 
 def _make_round(task_id: str = "task-1",
-                notified: set | None = None,
-                responded: set | None = None,
+                notified: set = None,
+                responded: set = None,
                 round_number: int = 0) -> BroadcastRound:
     """快速构造 BroadcastRound"""
     br = BroadcastRound(task_id=task_id)