diff --git a/neutron/tests/tempest/services/network/json/network_client.py b/neutron/tests/tempest/services/network/json/network_client.py
index 36a7f5b..12ba685 100644
--- a/neutron/tests/tempest/services/network/json/network_client.py
+++ b/neutron/tests/tempest/services/network/json/network_client.py
@@ -713,7 +713,7 @@
 
     def _subports_action(self, action, trunk_id, subports):
         uri = '%s/trunks/%s/%s' % (self.uri_prefix, trunk_id, action)
-        resp, body = self.put(uri, jsonutils.dumps(subports))
+        resp, body = self.put(uri, jsonutils.dumps({'sub_ports': subports}))
         body = self.deserialize_single(body)
         self.expected_success(200, resp.status)
         return service_client.ResponseBody(resp, body)