diff --git a/tests/ops/run_backup_drill.sh b/tests/ops/run_backup_drill.sh
index 80385295..292b4902 100755
--- a/tests/ops/run_backup_drill.sh
+++ b/tests/ops/run_backup_drill.sh
@@ -57,6 +57,7 @@ cleanup() {
     "$PG_CTL" -D "$RESTORE_PG" stop -m fast >/dev/null 2>&1 || true
     rm -rf "$RESTORE_PG"
   fi
+  rm -rf /tmp/u7bk-18997
   if [[ -n "$ASIDE" && -d "$ASIDE" ]]; then rm -rf "$ASIDE"; fi
   if [[ "$OWNED" -eq 1 ]]; then ops_pg_remove "$ROOT" "$NAME" || true; fi
   exit "$ec"
@@ -210,7 +211,8 @@ ops_kill_checked "$APP_PIDFILE" "127.0.0.1:$APP_PORT" TERM || true
 
 echo "[backup] restore to new data directory on $RESTORE_PG_PORT"
 RESTORE_PG="$RESULTS/restore/pgdata"
-mkdir -p "$RESTORE_PG" "$RESULTS/restore/sock"
+mkdir -p "$RESTORE_PG" /tmp/u7bk-18997
+chmod 700 /tmp/u7bk-18997
 cp -a "$BASE/." "$RESTORE_PG/"
 cat >>"$RESTORE_PG/postgresql.auto.conf" <<EOF
 archive_mode = 'off'
@@ -220,7 +222,7 @@ rm -f "$RESTORE_PG/postmaster.pid" "$RESTORE_PG/standby.signal"
 touch "$RESTORE_PG/recovery.signal"
 chmod 700 "$RESTORE_PG"
 "$PG_CTL" -D "$RESTORE_PG" -l "$RESULTS/restore/postgres.log" -t 600 -w \
-  -o "-p ${RESTORE_PG_PORT} -k ${RESULTS}/restore/sock" start
+  -o "-p ${RESTORE_PG_PORT} -k /tmp/u7bk-18997" start
 export PGPORT="$RESTORE_PG_PORT"
 recovered=0
 for _ in $(seq 1 300); do