--- a/misc/migration/3.10.0_Any.py	Tue Sep 15 18:30:05 2015 +0200
+++ b/misc/migration/3.10.0_Any.py	Tue Sep 15 18:39:09 2015 +0200
@@ -1,3 +1,5 @@
+from six import text_type
+
 from cubicweb.server.session import hooks_control
 
 for uri, cfg in config.read_sources_file().items():
@@ -24,7 +26,7 @@
     repo.sources_by_uri.pop(uri)
     config = u'\n'.join('%s=%s' % (key, value) for key, value in cfg.items()
                         if key != 'adapter' and value is not None)
-    create_entity('CWSource', name=unicode(uri), type=unicode(cfg['adapter']),
+    create_entity('CWSource', name=text_type(uri), type=text_type(cfg['adapter']),
                   config=config)
 commit()