diff --git a/litellm/proxy/_types.py b/litellm/proxy/_types.py
index f4c3a03fb6f..dfc7c3f353c 100644
--- a/litellm/proxy/_types.py
+++ b/litellm/proxy/_types.py
@@ -1123,7 +1123,7 @@ class NewMCPServerRequest(LiteLLMPydanticObjectBase):
     authorization_url: Optional[str] = None
     token_url: Optional[str] = None
     registration_url: Optional[str] = None
-    oauth2_flow: Optional[str] = None
+    oauth2_flow: Optional[Literal["client_credentials", "authorization_code"]] = None
     allow_all_keys: bool = False
     available_on_public_internet: bool = True
     is_byok: bool = False