diff --git a/smssend/smssend.py b/smssend/smssend.py
index a6a3061..6502620 100644
--- a/smssend/smssend.py
+++ b/smssend/smssend.py
@@ -8,6 +8,7 @@ Features:
 - 验证码生成与验证
 - 配置从文件读取
 """
+import os
 import datetime
 import random
 import string