diff --git a/tests/test_reference_runs/callab_tests.py b/tests/test_reference_runs/callab_tests.py
index 0e04d7e80fa0ab3e6d065f20004d3b615950df76..3923bf478593afcc7592cb43a75a4952b96c0a38 100644
--- a/tests/test_reference_runs/callab_tests.py
+++ b/tests/test_reference_runs/callab_tests.py
@@ -584,11 +584,7 @@ automated_test_config = {
             "run": "9028",  # Original run: "1723",
             "karabo-id": "SCS_DET_DSSC1M-1",
             "slow-data-path": "SCS_CDIDET_DSSC/FPGA/PPT_Q",
-            "slow-data-aggregators":
-                - 1
-                - 2
-                - 3
-                - 4
+            "slow-data-aggregators": [1, 2, 3, 4]
         },
         "reference-folder": "{}/{}/{}",
     },
@@ -602,6 +598,7 @@ automated_test_config = {
             "run": "9028",  # Original run: "1723",
             "karabo-id": "SCS_DET_DSSC1M-1",
             "slow-data-path": "SCS_CDIDET_DSSC/FPGA/PPT_Q",
+            "slow-data-aggregators": [1, 2, 3, 4]
         },
         "reference-folder": "{}/{}/{}",
     },