diff --git a/steth/stethclient/agent_api.py b/steth/stethclient/agent_api.py
index 43e06fb..4c75657 100644
--- a/steth/stethclient/agent_api.py
+++ b/steth/stethclient/agent_api.py
@@ -192,7 +192,7 @@ class CheckPortsOnBr(Lister):
         server = setup_server(parsed_args.agent)
         try:
             res = server.check_ports_on_br(parsed_args.bridge,
-                                           parsed_args.port)
+                                           [parsed_args.port])
             self.log.debug('Response is %s' % res)
             if res['code'] == 1:
                 Logger.log_fail(res['message'])