diff --git a/simulation.py b/simulation.py
index 9dabfb1..ed1a875 100644
--- a/simulation.py
+++ b/simulation.py
@@ -4,6 +4,7 @@ from api.s36_wda_cal import *
 # from get_real_status import *
 from datetime import datetime,timedelta
 from math import modf
+import os
 import json
 import pytz
 import requests