diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 86de3ba09..64b1cd25d 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -1,7 +1,7 @@
 import http.client
 import inspect
 import warnings
-from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Type, Union, cast
+from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Type, Union
 
 from fastapi import routing
 from fastapi._compat import (