diff --git a/src/common/socks5.py b/src/common/socks5.py
index 55f5982e7fe2ec2390b4316d135ad4799f7076ef..7c284a2e6348c34cc5513f6369ef515db4d1073b 100644
--- a/src/common/socks5.py
+++ b/src/common/socks5.py
@@ -26,6 +26,7 @@
 import socket
 import struct
 import sha
+import os
 
 from errno import EWOULDBLOCK
 from errno import ENOBUFS