diff --git a/workers/openai/client.py b/workers/openai/client.py
index e34cc90..24484c6 100644
--- a/workers/openai/client.py
+++ b/workers/openai/client.py
@@ -66,6 +66,7 @@ def _create_auth_data(self, message: Dict[str, Any]) -> Dict[str, Any]:
             "cost": message["cost"],
             "endpoint": message["endpoint"],
             "reqnum": message["reqnum"],
+            "request_idx": message.get("request_idx",  message["reqnum"]),  # Use reqnum as fallback
             "url": message["url"],
         }