diff --git a/atlas/sim/atlas-sim.spec b/atlas/sim/atlas-sim.spec
index 86edf3d063aab4547583005e627140662f495052..0359024893b9d4df7606b63c813ac3840e61b44e 100644
--- a/atlas/sim/atlas-sim.spec
+++ b/atlas/sim/atlas-sim.spec
@@ -1,5 +1,5 @@
 bmkexe=./atlas-sim/atlas-sim-bmk.sh 
-bmkopts="-n 2 -e 3 -t 2"
+bmkopts="-e 3 -t 2"
 bmkdir=./atlas-sim
 bmkdescription="ATLAS Sim (GEANT4) based on athena version 21.0.15"
 DOCKER_IMAGE=atlas-sim-bmk