diff --git a/backup.sh b/backup.sh
index ff1351c..cf3fa67 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 BACKUP_DATE=$(date +"%Y-%m-%d")
 BACKUP_BASENAME=$S3_BUCKET_NAME$BACKUP_DATE.tar