diff --git a/oslo/db/sqlalchemy/test_migrations.py b/oslo/db/sqlalchemy/test_migrations.py
index 9def0ed..d669577 100644
--- a/oslo/db/sqlalchemy/test_migrations.py
+++ b/oslo/db/sqlalchemy/test_migrations.py
@@ -243,8 +243,8 @@ class WalkVersionsMixin(object):
                 if check:
                     check(self.migrate_engine, data)
         except exc.DbMigrationError:
-            LOG.error(_LE("Failed to migrate to version %s on engine %s") %
-                      (version, self.migrate_engine))
+            msg = _LE("Failed to migrate to version %(ver)s on engine %(eng)s")
+            LOG.error(msg, {"ver": version, "eng": self.migrate_engine})
             raise
 
 
diff --git a/oslo/db/sqlalchemy/utils.py b/oslo/db/sqlalchemy/utils.py
index 5aa9341..92f7049 100644
--- a/oslo/db/sqlalchemy/utils.py
+++ b/oslo/db/sqlalchemy/utils.py
@@ -686,7 +686,8 @@ def is_backend_avail(backend, database, user=None, passwd=None):
     except Exception as e:
         # intentionally catch all to handle exceptions even if we don't
         # have any backend code loaded.
-        LOG.info(_LI("The %s backend is unavailable: %s"), backend, e)
+        msg = _LI("The %(backend)s backend is unavailable: %(exception)s")
+        LOG.info(msg, {"backend": backend, "exception": e})
         return False
     else:
         connection.close()
diff --git a/tox.ini b/tox.ini
index 2d3bdd8..09d9bdc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,7 +45,7 @@ commands =
 # see https://bugs.launchpad.net/hacking/+bug/1329363
 
 show-source = True
-ignore = E123,E125,E128,E265,H305,H307,H703,H803,H904
+ignore = E123,E125,E128,E265,H305,H307,H803,H904
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build