diff --git a/benchmarks/sampling_ecal/sim_emcal_barrel_electrons.sh b/benchmarks/sampling_ecal/sim_emcal_barrel_electrons.sh
index 67f22377117b6c52ae75e67b9961b766af9ea38d..99935bdd0b24b470ec861a470011ad4450c7b04f 100644
--- a/benchmarks/sampling_ecal/sim_emcal_barrel_electrons.sh
+++ b/benchmarks/sampling_ecal/sim_emcal_barrel_electrons.sh
@@ -29,7 +29,8 @@ echo "CB_EMCAL_NUMEV = ${CB_EMCAL_NUMEV}"
 echo "CB_EMCAL_COMPACT_PATH = ${CB_EMCAL_COMPACT_PATH}"
 
 # Generate the input events
-python benchmarks/sampling_ecal/gen_particles.py ${CB_EMCAL_GEN_FILE} --angmin 90 --angmax 90 --parray ${CB_EMCAL_ENERGY} --particles 11
+python benchmarks/sampling_ecal/scripts/gen_particles.py ${CB_EMCAL_GEN_FILE} \
+    --angmin 90 --angmax 90 --parray ${CB_EMCAL_ENERGY} --particles="-11"
 if [[ "$?" -ne "0" ]] ; then
   echo "ERROR running script: generating input events"
   exit 1