diff --git a/litellm/exceptions.py b/litellm/exceptions.py
index df77c2c8f91..eb5437a9121 100644
--- a/litellm/exceptions.py
+++ b/litellm/exceptions.py
@@ -238,7 +238,7 @@ class OpenRouterRegionNotSupportedError(NotFoundError):
         max_retries: int | None = None,
         num_retries: int | None = None,
         region: str | None = None,
-    ):
+    ) -> None:
         self.region = region
         super().__init__(
             message=message,
diff --git a/litellm/llms/openrouter/chat/transformation.py b/litellm/llms/openrouter/chat/transformation.py
index 49c429cdfc7..61d527b6e48 100644
--- a/litellm/llms/openrouter/chat/transformation.py
+++ b/litellm/llms/openrouter/chat/transformation.py
@@ -52,8 +52,8 @@ class OpenrouterConfig(OpenAIGPTConfig):
     def __init__(
         self,
         region: str | None = None,
-        **kwargs,
-    ):
+        **kwargs: object,
+    ) -> None:
         self.region = region
         super().__init__(**kwargs)