diff --git a/src/rag/qa_v1_1_73/api.py b/src/rag/qa_v1_1_73/api.py
index 00cc848..87231a2 100644
--- a/src/rag/qa_v1_1_73/api.py
+++ b/src/rag/qa_v1_1_73/api.py
@@ -5,6 +5,7 @@ import json
 import queue
 import threading
 from functools import lru_cache
+import os
 from typing import Any, Dict, Optional
 
 from fastapi import APIRouter, HTTPException