diff --git a/tests/tests_devices/test_mcs_card.py b/tests/tests_devices/test_mcs_card.py
index d6b38c9..363f92a 100644
--- a/tests/tests_devices/test_mcs_card.py
+++ b/tests/tests_devices/test_mcs_card.py
@@ -172,7 +172,11 @@ def test_on_mca_data(mock_det, values, expected_nothing):
     [
         (
             {"scan_id": 123},
-            {"mca1": [100, 120, 140], "mca3": [200, 220, 240], "mca4": [300, 320, 340]},
+            {
+                "mca1": {"value": [100, 120, 140]},
+                "mca3": {"value": [200, 220, 240]},
+                "mca4": {"value": [300, 320, 340]},
+            },
         )
     ],
 )