Package updated to same version

Hi,

I recently did slight modifications to the basename utility from the coreutils package.
I downloaded the source by typing "apt-get source coreutils", added a new option to the program, updated the respective manpage, build and installed it using "dpkg-buildpackage -uc -b && dpkg -i ../coreutils*.deb".

All that works perfectly. Now what's strange about it, is that my aptitude cronjob is updating the coreutils package from the repositories to the same but unmodified release that is already installed.

I could set the package status to "hold" but that would prevent the package from getting real updates.

Can anybody shed some light on that?

Thanks a lot,
Gunther