diff --git a/Control/CalypsoExample/Reconstruction/scripts/faserMDC_reco.py b/Control/CalypsoExample/Reconstruction/scripts/faserMDC_reco.py
index 5a1ac29c1a78b44e04f599267a9ce2aa7f268bca..f9003eeceda4528ce2a7af132971c5e1e5447cd2 100755
--- a/Control/CalypsoExample/Reconstruction/scripts/faserMDC_reco.py
+++ b/Control/CalypsoExample/Reconstruction/scripts/faserMDC_reco.py
@@ -72,6 +72,9 @@ ConfigFlags.IOVDb.DatabaseInstance = "OFLP200"   # Use MC conditions for now
 ConfigFlags.Input.ProjectName = "data20"
 ConfigFlags.GeoModel.Align.Dynamic    = False
 
+# For tracking
+ConfigFlags.TrackingGeometry.MaterialSource = "/cvmfs/faser.cern.ch/repo/sw/database/DBRelease/current/acts/material-maps.json"
+
 # TI12 Cosmics geometry
 if runtype == "TI12Data":
     ConfigFlags.GeoModel.FaserVersion = "FASER-01"