diff --git a/test/round_trip.sh b/test/round_trip.sh
index e1c3336..1aa1648 100755
--- a/test/round_trip.sh
+++ b/test/round_trip.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 if [ $# -ne 2 ]; then
     echo "Usage: ${0##*/} program target"