diff --git a/nova/tests/unit/conf_fixture.py b/nova/tests/unit/conf_fixture.py
index c037754362be..4fa40a79c1da 100644
--- a/nova/tests/unit/conf_fixture.py
+++ b/nova/tests/unit/conf_fixture.py
@@ -66,7 +66,7 @@ class ConfFixture(config_fixture.Config):
         self.conf.set_default('sqlite_synchronous', False, group='database')
 
         # key_manager group
-        self.conf.set_default('api_class',
+        self.conf.set_default('backend',
                               'nova.keymgr.conf_key_mgr.ConfKeyManager',
                               group='key_manager')