diff --git a/rhodecode/lib/dbmigrate/migrate/changeset/constraint.py b/rhodecode/lib/dbmigrate/migrate/changeset/constraint.py
--- a/rhodecode/lib/dbmigrate/migrate/changeset/constraint.py
+++ b/rhodecode/lib/dbmigrate/migrate/changeset/constraint.py
@@ -28,7 +28,7 @@ class ConstraintChangeset(object):
     def __do_imports(self, visitor_name, *a, **kw):
         engine = kw.pop('engine', self.table.bind)
         from rhodecode.lib.dbmigrate.migrate.changeset.databases.visitor import (get_engine_visitor,
-                                                         run_single_visitor)
+                                                                                 run_single_visitor)
         visitorcallable = get_engine_visitor(engine, visitor_name)
         run_single_visitor(engine, visitorcallable, self, *a, **kw)