Use the max size filter

Hi, I am trying to limit the max file size to the image.

This is what I am doing in my theme functions.php

function pdo_avatar_limit($size) {
$size = 102400;
return $size;
}
add_filter(‘simple_local_avatars_upload_limit’, ‘pdo_avatar_limit’);

I dont know what is the problem, but it seems that the filter is never called because I still can upload big images (even if I do $size = 10;)

http://wordpress.org/plugins/simple-local-avatars/