Make alias take icon of the .app it points to

1. I have a blah.app, and on desktop there is an alias to this app


2. I went to http://ift.tt/18wdFYy and replace the icon with my icon, same name


3. I went to blah.app/ and created a new folder next to the blah.app/Contents folder, this made the blah.app icon update to show mine however the icon of the alias file on desktop did not change.

Any ideas on why this is so? I know I can drag the icon over this alias file, but im trying to figure out whats going on here, why isn't taking my icon? :(

Thanks!