diff -r cd09178c80a8 -r f69288934d66 cubicweb/server/migractions.py
--- a/cubicweb/server/migractions.py	Wed Feb 08 16:05:00 2017 +0100
+++ b/cubicweb/server/migractions.py	Mon Mar 06 15:01:41 2017 +0100
@@ -268,7 +268,7 @@
                 written_format = format_file.readline().strip()
                 if written_format in ('portable', 'native'):
                     format = written_format
-        repo = self.repo = repository.Repository(self.config, bootstrap=False)
+        repo = self.repo = repository.Repository(self.config)
         source = repo.system_source
         try:
             source.restore(osp.join(tmpdir, source.uri), self.confirm, drop, format)