chown and chgrp on 4.5 vs 5.0

[Jerry Geis <geisj@xxxxxxxxxxxxxxx>]

I just noticed that on centso 4.5 I have an executable with the +s 
(chmod +s myexe)
doing a chmod root myexe and chown root myexe does NOT affect the +s 
setting.

However, on centos 5 this is not the case.
chmod +s myexe
chown root myexe or chgrp root myexe
will DROP the +s status.

How can I get around this?
I want to keep the owner, group, world settings.

Thanks,

Jerry
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