diff --git a/src/flamenco/runtime/tests/run_ledger_backtest.sh b/src/flamenco/runtime/tests/run_ledger_backtest.sh
index b1e94f1f122..468f157d341 100755
--- a/src/flamenco/runtime/tests/run_ledger_backtest.sh
+++ b/src/flamenco/runtime/tests/run_ledger_backtest.sh
@@ -120,6 +120,11 @@ while [[ $# -gt 0 ]]; do
         shift
         shift
         ;;
+    --wrapper)
+        DEBUG=( $2 )
+        shift
+        shift
+        ;;
     -*|--*)
        echo "unknown option $1"
        exit 1