diff --git a/operation-tools/templates/sf-daq_detector_retrieve_writer.start.sh b/operation-tools/templates/sf-daq_detector_retrieve_writer.start.sh
index 406e808..df474f0 100644
--- a/operation-tools/templates/sf-daq_detector_retrieve_writer.start.sh
+++ b/operation-tools/templates/sf-daq_detector_retrieve_writer.start.sh
@@ -13,4 +13,6 @@ conda activate sf-daq
 M=$1
 C={{ detector_retrieve_cores }}
 
+export OMP_NUM_THREADS=1
+
 taskset -c $C python /home/dbe/git/sf_daq_broker/sf_daq_broker/writer/start.py  --writer_id $M  --writer_type 1