diff --git a/master/product/Vifib/tests/testVifibSlapWebService.py b/master/product/Vifib/tests/testVifibSlapWebService.py
index e1637f3da910e8f86b4f2bbfb55668e7abfb370f..01d3bdcabf4205365735247a7afe2f30e4481fc4 100644
--- a/master/product/Vifib/tests/testVifibSlapWebService.py
+++ b/master/product/Vifib/tests/testVifibSlapWebService.py
@@ -2880,6 +2880,7 @@ class TestVifibSlapWebService(testVifibMixin):
         'slap_software_release_url': software_release_uri,
         'slap_software_type': 'RootSoftwareInstance',
         'test_parameter': 'lala',
+        'slave_instance_list': [],
         'ip_list': [],
     }
     self.assertSameDict(expected, result)