diff --git a/monitor_backup_dir.sh b/monitor_backup_dir.sh
index f6bfb4d..579d4ab 100644
--- a/monitor_backup_dir.sh
+++ b/monitor_backup_dir.sh
@@ -1,14 +1,15 @@
+#!/usr/bin/bash
+
 target_dir=/var/borg
 hash_dir=/var/hashes
-mail_to="xxx@xxxx.xxx"
+mail_to="xxxxx@xxxx.xxx"
 
 find ${target_dir}/* -maxdepth 0 -type d  | while read line; do
     host=$(echo "$line"  | awk -F" +|/" '{print $NF}')
     if [[ ! $host =~ ^(lost\+found)$ ]]; then
         hash=$(mtree -cxp "$line" | grep -E -- ^\[^\#] | sha256sum)
         if test -f "${hash_dir}/$host"; then
-            difference=$(diff ${hash_dir}/$host <(echo "$hash"))
-            if [ "$difference" == "" ]; then
+            if [ "$hash" == "$(head -c99 < "${hash_dir}/${host}")" ]; then
                 mail_body="The host ${host} was not backed up since the last check. Please forward this mail to the owner of the affected system."
                 echo "$mail_body" | mail -s "${host} not backed up!" "$mail_to"
             fi
@@ -18,4 +19,4 @@ find ${target_dir}/* -maxdepth 0 -type d  | while read line; do
         fi
         echo "$hash" > "${hash_dir}/$host"
     fi
-done
+done
\ No newline at end of file