Install package with arch=amd64

Hi list

On a x86_64 system (CentOS 5) I'm trying to use yum to find/install a
package that (for unknown reasons) has arch set to amd64. The package
in question is meant for CentOS/Redhat x86_64. Using localinstall I
get the following:

root@t64-mon-app:~# yum localinstall <package>.amd64.rpm
Cannot add package <package>.amd64.rpm to transaction. Not a
compatible architecture: amd64
Nothing to do

Is there a way around this problem? Letting yum know that amd64 is ok
as arch. Installing using rpm works fine but I want it in a yum repo
to enable remote installs.

Cheers
Peter Östlin