1 files changed, 4 insertions, 2 deletions

diff --git a/scripts/play.sh b/scripts/play.sh
index ac2a10b12..69725da93 100755
--- a/scripts/play.sh
+++ b/scripts/play.sh
@@ -1,4 +1,6 @@
-#!/usr/bin/env sh
+#!/bin/sh
+
+set -eu
 
 if [ ! -f "dist/server.js" ]; then
   echo "Missing server file (server.js)."
@@ -7,7 +9,7 @@ fi
 
 max=${1:-3}
 
-for i in $(seq 1 $max); do
+for i in $(seq 1 "$max"); do
   NODE_ENV=test NODE_APP_INSTANCE=$i node dist/server.js &
   sleep 1
 done