diff --git a/prodtests/full-system-test/dpl-workflow.sh b/prodtests/full-system-test/dpl-workflow.sh
index 202352730ddc7..54f10b36b4ead 100755
--- a/prodtests/full-system-test/dpl-workflow.sh
+++ b/prodtests/full-system-test/dpl-workflow.sh
@@ -46,7 +46,7 @@ source $GEN_TOPO_MYDIR/getCommonArgs.sh || { echo "getCommonArgs.sh failed" 1>&2
 workflow_has_parameter CALIB && { source $O2DPG_ROOT/DATA/common/setenv_calib.sh; [[ $? != 0 ]] && echo "setenv_calib.sh failed" 1>&2 && exit 1; }
 
 [[ -z ${SHM_MANAGER_SHMID:-} ]] && ( [[ $EXTINPUT == 1 ]] || [[ $NUMAGPUIDS != 0 ]] ) && ARGS_ALL+=" --no-cleanup"
-[[ $GPUTYPE != "CPU" || ( ! -z ${OPTIMIZED_PARALLEL_ASYNC:-} && -z ${SETENV_NO_ULIMIT:-} ) ]] && ARGS_ALL+=" --shm-mlock-segment-on-creation 1"
+[[ ( $GPUTYPE != "CPU" || -n ${OPTIMIZED_PARALLEL_ASYNC:-} ) && ${SETENV_NO_ULIMIT:-0} == 0 ]] && ARGS_ALL+=" --shm-mlock-segment-on-creation 1"
 if [[ $EPNSYNCMODE == 1 ]] || type numactl >/dev/null 2>&1 && [[ `numactl -H | grep "node . size" | wc -l` -ge 2 ]]; then
   [[ $NUMAGPUIDS != 0 ]] && ARGS_ALL+=" --child-driver 'numactl --membind $NUMAID --cpunodebind $NUMAID'"
 fi