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diff --git a/keystone/common/sql/migrate_repo/versions/031_drop_credential_indexes.py b/keystone/common/sql/migrate_repo/versions/031_drop_credential_indexes.py
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+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2013 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import sqlalchemy
+
+
+def upgrade(migrate_engine):
+    #This migration is relevant only for mysql because for all other
+    #migrate engines these indexes were successfully dropped.
+    if migrate_engine.name != 'mysql':
+        return
+    meta = sqlalchemy.MetaData(bind=migrate_engine)
+    table = sqlalchemy.Table('credential', meta, autoload=True)
+    for index in table.indexes:
+        index.drop()
+
+
+def downgrade(migrate_engine):
+    if migrate_engine.name != 'mysql':
+        return
+    meta = sqlalchemy.MetaData(bind=migrate_engine)
+    table = sqlalchemy.Table('credential', meta, autoload=True)
+    index = sqlalchemy.Index('user_id', table.c['user_id'])
+    index.create()
+    index = sqlalchemy.Index('credential_project_id_fkey',
+                             table.c['project_id'])
+    index.create()