diff --git a/tests/resources/test_child.py b/tests/resources/test_child.py
index 7c283c8c0..90e9ae361 100644
--- a/tests/resources/test_child.py
+++ b/tests/resources/test_child.py
@@ -162,7 +162,7 @@ def mock_run_function_that_sometimes_fails(analysis_id, input_values, *args, **k
 
         responding_service = MockService(
             backend=GCPPubSubBackend(project_name="blah"),
-            service_id=f"testing/service-for-parallelised-questions-failure:{MOCK_SERVICE_REVISION_TAG}",
+            service_id=f"testing/service-for-parallelised-questions-failure-2:{MOCK_SERVICE_REVISION_TAG}",
             run_function=functools.partial(mock_run_function_that_sometimes_fails, runs=Value("d", 0)),
         )