diff --git a/plugins/inputs/postfix/README.md b/plugins/inputs/postfix/README.md
index 3dab2b39d..57abd0f5b 100644
--- a/plugins/inputs/postfix/README.md
+++ b/plugins/inputs/postfix/README.md
@@ -29,7 +29,7 @@ $ sudo chmod g+r /var/spool/postfix/maildrop
 
 Posix ACL:
 ```sh
-$ sudo setfacl -Rdm u:telegraf:rX /var/spool/postfix/{active,hold,incoming,deferred,maildrop}
+$ sudo setfacl -Rdm g:telegraf:rX /var/spool/postfix/{active,hold,incoming,deferred,maildrop}
 ```
 
 ### Measurements & Fields: