--- a/server/migractions.py	Thu Jan 15 16:39:35 2015 +0100
+++ b/server/migractions.py	Thu Jan 15 16:44:36 2015 +0100
@@ -44,7 +44,6 @@
 from logilab.common.decorators import cached, clear_cache
 
 from yams.constraints import SizeConstraint
-from yams.schema2sql import eschema2sql, rschema2sql, unique_index_name
 from yams.schema import RelationDefinitionSchema
 
 from cubicweb import CW_SOFTWARE_ROOT, AuthenticationError, ExecutionError
@@ -56,6 +55,7 @@
 from cubicweb import repoapi
 from cubicweb.migration import MigrationHelper, yes
 from cubicweb.server import hook, schemaserial as ss
+from cubicweb.server.schema2sql import eschema2sql, rschema2sql, unique_index_name
 from cubicweb.server.utils import manager_userpasswd
 from cubicweb.server.sqlutils import sqlexec, SQL_PREFIX