diff --git a/fastapi/_compat/shared.py b/fastapi/_compat/shared.py
index bfa5296dc..140c860c2 100644
--- a/fastapi/_compat/shared.py
+++ b/fastapi/_compat/shared.py
@@ -24,7 +24,13 @@ from starlette.datastructures import UploadFile
 from typing_extensions import Annotated, get_args, get_origin
 
 # Copy from Pydantic v2, compatible with v1
-if sys.version_info < (3, 10):
+if sys.version_info < (3, 9):
+    # Pydantic no longer supports Python 3.8, this might be incorrect, but the code
+    # this is used for is also never reached in this codebase, as it's a copy of
+    # Pydantic's lenient_issubclass, just for compatibility with v1
+    # TODO: remove when dropping support for Python 3.8
+    WithArgsTypes: tuple[Any, ...] = ()
+elif sys.version_info < (3, 10):
     WithArgsTypes: tuple[Any, ...] = (typing._GenericAlias, types.GenericAlias)  # pyright: ignore[reportAttributeAccessIssue]
 else:
     WithArgsTypes: tuple[Any, ...] = (