Fisheye effect: alternative icon directory does not work

After following the instructions here to add larger icons for the Fisheye effect, I found that it did not work, and instead the src= for the icons continues to use the default /modules/service_links/images/ directory.

I looked into the issue a little and found that it seems to be because of line 469:
$image[0] = $image[0] . variable_get('service_links_fisheye_folder', '');

From what I discovered, $image is an array of single characters - so I don't think that you can add the variable_get('service_links_fisheye_folder', ''); variable to it that way. In fact, when I output the $image variable before and after the addition of the new directory string, it returns the same results:

sites/example.com/modules/service_links/images/myspace.png
sites/example.com/modules/service_links/images/myspace.png