diff --git a/start-test.sh b/start-test.sh
index 313a128..b56417c 100755
--- a/start-test.sh
+++ b/start-test.sh
@@ -12,6 +12,8 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 
+export OMP_NUM_THREADS=1
+
 if [ $# -eq 0 ]; then
     exec ./start.sh test both --send
 fi