diff --git a/oslo_db/sqlalchemy/migration_cli/ext_alembic.py b/oslo_db/sqlalchemy/migration_cli/ext_alembic.py
index 0348a37..a855321 100644
--- a/oslo_db/sqlalchemy/migration_cli/ext_alembic.py
+++ b/oslo_db/sqlalchemy/migration_cli/ext_alembic.py
@@ -94,6 +94,15 @@ class AlembicExtension(ext_base.MigrationExtensionBase):
     def has_revision(self, rev_id):
         if rev_id in ['base', 'head']:
             return True
+
+        # Although alembic supports relative upgrades and downgrades,
+        # get_revision always returns False for relative revisions.
+        # Since only alembic supports relative revisions, assume the
+        # revision belongs to this plugin.
+        if rev_id:  # rev_id can be None, so the check is required
+            if '-' in rev_id or '+' in rev_id:
+                return True
+
         script = alembic_script.ScriptDirectory(
             self.config.get_main_option('script_location'))
         try:
diff --git a/oslo_db/tests/sqlalchemy/test_migrate_cli.py b/oslo_db/tests/sqlalchemy/test_migrate_cli.py
index 72d8b4e..8d2ae8d 100644
--- a/oslo_db/tests/sqlalchemy/test_migrate_cli.py
+++ b/oslo_db/tests/sqlalchemy/test_migrate_cli.py
@@ -109,6 +109,8 @@ class TestAlembicExtension(test_base.BaseTestCase):
                 'test')
             self.assertIs(True, self.alembic.has_revision(None))
             self.assertIs(True, self.alembic.has_revision('head'))
+            # relative revision, should be True for alembic
+            self.assertIs(True, self.alembic.has_revision('+1'))
 
     def test_has_revision_negative(self, command):
         with mock.patch(('oslo_db.sqlalchemy.migration_cli.'
@@ -202,6 +204,8 @@ class TestMigrateExtension(test_base.BaseTestCase):
             mocked.Collection().version.side_effect = ValueError
             self.assertIs(False, self.migrate.has_revision('test'))
             mocked.Collection().version.assert_called_once_with('test')
+            # relative revision, should be False for migrate
+            self.assertIs(False, self.migrate.has_revision('+1'))
 
 
 class TestMigrationManager(test_base.BaseTestCase):