diff --git a/tangostationcontrol/tangostationcontrol/test/clients/test_attr_wrapper.py b/tangostationcontrol/tangostationcontrol/test/clients/test_attr_wrapper.py
index da2130deb488c4edf7dd625699c58aa03326c35f..553f2d96d122b54d41dee6c04fdd421943a72950 100644
--- a/tangostationcontrol/tangostationcontrol/test/clients/test_attr_wrapper.py
+++ b/tangostationcontrol/tangostationcontrol/test/clients/test_attr_wrapper.py
@@ -43,6 +43,7 @@ class TestAttributeTypes(base.TestCase):
     def setUp(self):
         # Avoid the device trying to access itself as a client
         self.deviceproxy_patch = mock.patch.object(tangostationcontrol.devices.lofar_device,'DeviceProxy')
+        self.deviceproxy_patch.start()
         self.addCleanup(self.deviceproxy_patch.stop)
 
     class str_scalar_device(lofar_device):