diff --git a/trackers/roman_pot_simu.sh b/trackers/roman_pot_simu.sh
index 7f15f490dcdcaf8694db65736c28304c8c728a44..bbf8833efa6fb66a60b248a8c67c75115e09eaee 100755
--- a/trackers/roman_pot_simu.sh
+++ b/trackers/roman_pot_simu.sh
@@ -2,7 +2,9 @@
 
 source /usr/local/bin/thisdd4hep.sh
 
+cp -r NPDet/src/GenericDetectors/trackers/compact/* .
+
 ddsim --runType batch -N 300 \
 	--inputFiles ./data/forward_ions.hepmc \
-	--compactFile ./trackers/roman_pot.xml \
+	--compactFile ./roman_pot.xml \
 	--outputFile ./sim_output/roman_pot_out.root