[PHP Errors and a Possible Solution?]

Ok so I have been getting errors in my log files and most of them seem PHP related and I was wondering if you guys could help.

Here's the error:

[client **.**.*.**] PHP Notice: Use of undefined constant MSG_ADD - assumed 'MSG_ADD' in /var/www/ASG/lib/messages.php on line 5

And here is the way MSG_ADD is defined in messages.php

define(MSG_ADD,'Record Added Successfully.');

I was wondering if I change the code to this:

define('MSG_ADD','Record Added Successfully.');

would that correct the errors? Their are about 150 times that Define is used in messages.php and I want to be sure that, that solution would correct the problem before I go in and change things around? Thanks