diff --git a/tests/test_invalid_sequence_param.py b/tests/test_invalid_sequence_param.py
index f03d18fb5..475786adb 100644
--- a/tests/test_invalid_sequence_param.py
+++ b/tests/test_invalid_sequence_param.py
@@ -1,4 +1,4 @@
-from typing import Dict, List, Tuple
+from typing import Dict, List, Optional, Tuple
 
 import pytest
 from fastapi import FastAPI, Query