diff --git a/litellm/litellm_core_utils/json_validation_rule.py b/litellm/litellm_core_utils/json_validation_rule.py
index 861b0b9373a..32cb1eda357 100644
--- a/litellm/litellm_core_utils/json_validation_rule.py
+++ b/litellm/litellm_core_utils/json_validation_rule.py
@@ -57,9 +57,7 @@ def normalize_json_schema_types(
                 # to mark a field nullable (e.g. ["STRING", "NULL"]). Without this
                 # branch those entries fall through to the generic list recursion,
                 # which leaves the bare strings uppercase.
-                normalized_schema[key] = [
-                    type_mapping.get(entry, entry) if isinstance(entry, str) else entry for entry in value
-                ]
+                normalized_schema[key] = [type_mapping.get(entry, entry) for entry in value]
             elif key == "properties" and isinstance(value, dict):
                 # Recursively normalize properties
                 normalized_schema[key] = {