diff --git a/scripts/cluster/run-production-acceptance.sh b/scripts/cluster/run-production-acceptance.sh
index c5df9be..58b9a40 100755
--- a/scripts/cluster/run-production-acceptance.sh
+++ b/scripts/cluster/run-production-acceptance.sh
@@ -831,7 +831,9 @@ verify_pressure_report() {
 run_capacity_round() {
   local profile=$1
   local repetition=$2
-  local prefix=$report_root/${profile,,}-$repetition
+  local profile_slug
+  profile_slug=$(printf '%s' "$profile" | tr '[:upper:]' '[:lower:]')
+  local prefix=$report_root/$profile_slug-$repetition
   local pressure_report=$prefix-pressure.csv
   local pressure_stop=$temporary_root/pressure-stop
   local pressure_pid status=0