diff --git a/test/bin/ci_phase_iso_boot.sh b/test/bin/ci_phase_iso_boot.sh
index 9c7e2ee1a2..85f9896a32 100755
--- a/test/bin/ci_phase_iso_boot.sh
+++ b/test/bin/ci_phase_iso_boot.sh
@@ -75,6 +75,7 @@ prepare_scenario_sources
 LAUNCH_OK=true
 if ! parallel \
     ${progress} \
+    --jobs 10 \
     --results "${SCENARIO_INFO_DIR}/{/.}/boot.log" \
     --joblog "${LAUNCH_VMS_JOB_LOG}" \
     --delay 5 \