diff --git a/litellm/search/main.py b/litellm/search/main.py
index 29addce1094..983bd4b3733 100644
--- a/litellm/search/main.py
+++ b/litellm/search/main.py
@@ -6,7 +6,7 @@ import asyncio
 import contextvars
 from collections.abc import Coroutine
 from functools import partial
-from typing import Any, Final, cast
+from typing import Any, Final
 
 import httpx
 
@@ -250,9 +250,7 @@ def search(
         verbose_logger.debug("Search call - provider: %s", search_provider)
 
         auth_param_names: Final[frozenset[str]] = frozenset(
-            cast(  # cast-ok: BaseAWSLLM exposes authentication parameter names as list[str]
-                list[str], getattr(search_provider_config, "aws_authentication_params", ())
-            )
+            name for name in getattr(search_provider_config, "aws_authentication_params", ()) if isinstance(name, str)
         )
         auth_params: Final[dict[str, object]] = {  # mutable-ok: isolated provider signing params
             key: kwargs.pop(key) for key in tuple(kwargs) if key in auth_param_names