diff --git a/litellm/llms/vertex_ai/common_utils.py b/litellm/llms/vertex_ai/common_utils.py
index 137af3c4743..1579ae0df21 100644
--- a/litellm/llms/vertex_ai/common_utils.py
+++ b/litellm/llms/vertex_ai/common_utils.py
@@ -784,7 +784,7 @@ def _normalize_tuple_items(schema: dict[str, Any], depth: int = 0) -> None:
     tuple_items: Final = schema.get("items", None)
     if isinstance(tuple_items, list):
         if tuple_items:
-            schema["items"] = {"anyOf": tuple_items}  # mutable-ok: every walker here rewrites the schema tree in place
+            schema["items"] = {"anyOf": tuple_items}
         else:
             schema.pop("items")