diff --git a/tempest/stress/cleanup.py b/tempest/stress/cleanup.py
index 29c4401..d9b430e 100644
--- a/tempest/stress/cleanup.py
+++ b/tempest/stress/cleanup.py
@@ -24,7 +24,7 @@
 def cleanup():
     admin_manager = clients.AdminManager()
 
-    body = admin_manager.servers_client.list_servers({"all_tenants": True})
+    body = admin_manager.servers_client.list_servers(all_tenants=True)
     LOG.info("Cleanup::remove %s servers" % len(body['servers']))
     for s in body['servers']:
         try: