diff --git a/MC/bin/o2dpg_sim_workflow.py b/MC/bin/o2dpg_sim_workflow.py
index db33b2f8e..7c3dc19e3 100755
--- a/MC/bin/o2dpg_sim_workflow.py
+++ b/MC/bin/o2dpg_sim_workflow.py
@@ -1123,6 +1123,7 @@ def putConfigValues(listOfMainKeys=[], localCF = {}, globalTFConfig = True):
                          + ' --onlyDet TPC --TPCuseCCDB --interactionRate ' + str(INTRATE) + '  --tpc-lanes ' + str(NWORKERS_TF)             \
                          + ' --incontext ' + str(CONTEXTFILE) + ' --disable-write-ini --early-forward-policy always --forceSelectedDets ' \
                          + ' --tpc-distortion-type ' + str(tpcDistortionType)                                                             \
+                         + ' --n-threads-distortions 1 '                                                                                  \
                          + putConfigValues(["TPCGasParam","TPCGEMParam","TPCEleParam","TPCITCorr","TPCDetParam"],
                                               localCF=tpcLocalCF)
    TPCDigitask['cmd'] += (' --tpc-chunked-writer','')[args.no_tpc_digitchunking]