diff --git a/mysql-backup-s3/backup.sh b/mysql-backup-s3/backup.sh
index eb604e4..4eca867 100644
--- a/mysql-backup-s3/backup.sh
+++ b/mysql-backup-s3/backup.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 
 set -e
 
diff --git a/mysql-backup-s3/install.sh b/mysql-backup-s3/install.sh
index eda916a..4d1fc4f 100644
--- a/mysql-backup-s3/install.sh
+++ b/mysql-backup-s3/install.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 
 # exit if a command fails
 set -e
diff --git a/mysql-backup-s3/run.sh b/mysql-backup-s3/run.sh
index e3fb3c8..81c6224 100644
--- a/mysql-backup-s3/run.sh
+++ b/mysql-backup-s3/run.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#!/bin/sh
 
 set -e