--- a/server/serverconfig.py	Wed Oct 14 15:49:03 2015 +0200
+++ b/server/serverconfig.py	Mon Oct 26 15:22:09 2015 +0100
@@ -22,7 +22,8 @@
 
 import sys
 from os.path import join, exists
-from io import StringIO
+
+from six.moves import StringIO
 
 import logilab.common.configuration as lgconfig
 from logilab.common.decorators import cached