diff --git a/electrumpersonalserver/server/common.py b/electrumpersonalserver/server/common.py
index f936bac..41f334f 100644
--- a/electrumpersonalserver/server/common.py
+++ b/electrumpersonalserver/server/common.py
@@ -4,6 +4,7 @@
 import ssl
 import os
 import os.path
+import sys
 import logging
 import tempfile
 import platform