diff --git a/benchmark-fast/job-aps-sodshock.sh b/benchmark-fast/job-aps-sodshock.sh
index e6dfd55cdb5f3d27d1f1d2c9ec243a4a75854498..bdc8b918ad7c89537c4afef385fa1252948ce370 100644
--- a/benchmark-fast/job-aps-sodshock.sh
+++ b/benchmark-fast/job-aps-sodshock.sh
@@ -24,4 +24,4 @@ pushd swiftsim/examples/HydroTests/SodShock_3D
 export MPS_STAT_LEVEL=2
 export APS_ARGS="--collection-mode=mpi,omp"
 
-mpirun -np 1 aps $APS_ARGS ../../swift_mpi --hydro -v 1 --threads=64 -n 10000 -P Restarts:enable:0 sodShock.yml
+mpirun -np 4 aps $APS_ARGS ../../swift_mpi --hydro -v 1 --threads=64 -n 10000 -P Restarts:enable:0 sodShock.yml