diff --git a/tests/harness/test_report.py b/tests/harness/test_report.py
index 304f89408..7aa820a64 100644
--- a/tests/harness/test_report.py
+++ b/tests/harness/test_report.py
@@ -169,10 +169,17 @@ def test_few_measure_cert_surfaces_only_its_fired_measures_triggers() -> None:
 
     # Assert — 0036's gain-maximising package is solid-floor insulation plus the
     # low-energy-lighting upgrade (it lodges 7 low-energy + 0 incandescent fixed
-    # bulbs, so the LED top-up is a cheap positive-SAP lever, ADR-0023), and
-    # nothing else.
+    # bulbs, so the LED top-up is a cheap positive-SAP lever, ADR-0023) plus a
+    # zoned system tune-up: 0036 lodges its gas boiler as a PCDB main-heating
+    # index with no SAP code, which the heating generators now classify as a wet
+    # boiler eligible for a tune-up (#1399), so the boiler's controls upgrade
+    # joins the package.
     triggers: dict[str, MeasureTrigger] = _triggers_by_measure(report)
-    assert set(triggers) == {"solid_floor_insulation", "low_energy_lighting"}
+    assert set(triggers) == {
+        "solid_floor_insulation",
+        "low_energy_lighting",
+        "system_tune_up_zoned",
+    }
     assert triggers["solid_floor_insulation"].triggers == {
         "floor_insulation_thickness": None,
         "floor_construction_type": "Solid",