diff --git a/SOAP/group_membership.py b/SOAP/group_membership.py
index 1b0db8ff..35cc7e0d 100644
--- a/SOAP/group_membership.py
+++ b/SOAP/group_membership.py
@@ -1,5 +1,6 @@
 #!/bin/env python
 
+import os
 import time
 import socket