diff --git a/Examples/Scripts/Python/truth_tracking_gsf_refitting.py b/Examples/Scripts/Python/truth_tracking_gsf_refitting.py
index 79bd5c41b50..c30064cd7e0 100755
--- a/Examples/Scripts/Python/truth_tracking_gsf_refitting.py
+++ b/Examples/Scripts/Python/truth_tracking_gsf_refitting.py
@@ -36,6 +36,7 @@ def runRefittingGsf(
         "componentMergeMethod": acts.examples.ComponentMergeMethod.maxWeight,
         "mixtureReductionAlgorithm": acts.examples.MixtureReductionAlgorithm.KLDistance,
         "weightCutoff": 1.0e-4,
+        "reverseFilteringCovarianceScaling": 100.0,
         "level": acts.logging.INFO,
     }