diff --git a/litellm/proxy/_types.py b/litellm/proxy/_types.py
index 4a53e2bbb4f..41b36d46c75 100644
--- a/litellm/proxy/_types.py
+++ b/litellm/proxy/_types.py
@@ -776,7 +776,7 @@ class KeyRequestBase(GenerateRequestBase):
     tags: Optional[List[str]] = None
     enforced_params: Optional[List[str]] = None
     allowed_routes: Optional[list] = []
-    allowed_passthrough_routes: Optional[list] = []
+    allowed_passthrough_routes: Optional[list] = None
     rpm_limit_type: Optional[
         Literal["guaranteed_throughput", "best_effort_throughput"]
     ] = None  # raise an error if 'guaranteed_throughput' is set and we're overallocating rpm