diff --git a/lib/exchange/okx_options_lib.py b/lib/exchange/okx_options_lib.py
index e961f1b..cbb27f2 100644
--- a/lib/exchange/okx_options_lib.py
+++ b/lib/exchange/okx_options_lib.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 
 import json
 import math
+import os
 import re
 import threading
 import time