diff --git a/tangostationcontrol/tangostationcontrol/test/clients/test_opcua_client.py b/tangostationcontrol/tangostationcontrol/test/clients/test_opcua_client.py
index 2a6de20bf7d730997a15cbff9733ed02bbbab554..25968deded93d8d45160c5a1949521784ab59e7a 100644
--- a/tangostationcontrol/tangostationcontrol/test/clients/test_opcua_client.py
+++ b/tangostationcontrol/tangostationcontrol/test/clients/test_opcua_client.py
@@ -86,6 +86,7 @@ class TestOPCua(base.AsyncTestCase):
         m_opc_client_members.send_hello = asynctest.asynctest.CoroutineMock()
         m_objects_node = asynctest.Mock()
         m_objects_node.get_child = asynctest.asynctest.CoroutineMock()
+        m_objects_node.get_children_descriptions = asynctest.asynctest.CoroutineMock()
         m_opc_client_members.get_objects_node = asynctest.Mock(return_value=m_objects_node)
         m_opc_client.return_value = m_opc_client_members