diff --git a/tests/unit_tests/hyperion/experiment_plans/test_rotation_scan_plan.py b/tests/unit_tests/hyperion/experiment_plans/test_rotation_scan_plan.py
index 941dfbfde..88f6588fa 100644
--- a/tests/unit_tests/hyperion/experiment_plans/test_rotation_scan_plan.py
+++ b/tests/unit_tests/hyperion/experiment_plans/test_rotation_scan_plan.py
@@ -233,14 +233,13 @@ async def test_full_rotation_plan_smargon_settings(
 
 async def test_rotation_plan_moves_aperture_correctly(
     run_full_rotation_plan: RotationScanComposite,
-    test_rotation_params: RotationScan,
 ) -> None:
     aperture_scatterguard: ApertureScatterguard = (
         run_full_rotation_plan.aperture_scatterguard
     )
-    reading = await aperture_scatterguard.read()
-    aperture_state = reading[aperture_scatterguard.selected_aperture.name]["value"]
-    assert aperture_state == ApertureValue.SMALL
+    assert (
+        await aperture_scatterguard.selected_aperture.get_value() == ApertureValue.SMALL
+    )
 
 
 async def test_rotation_plan_smargon_doesnt_move_xyz_if_not_given_in_params(