FBSD82 sec patch -p4, uname still -p3

[n dhert]

I just applied security patch -p4 (last week -p3) to a freebsd 8.2 system
(generic kernel)
# freebsd-update fetch
# freebsd-update install
# ls -la /usr/src/sys/conf/newvers.sh
has date of today and contains
REVISION="8.2"
BRANCH="RELEASE-p4"
reboot
# uname -r
8.2-RELEASE-p3
still shows -p3 not -p4
# uname -a
FreeBSD mcsbu.cde.ua.ac.be 8.2-RELEASE-p3 FreeBSD 8.2-RELEASE-p3 #0: Tue Sep
27 18:45:57 UTC 2011
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

why?
-p4 was a small patch to linux emulation mode, which I don't have installed
is this why it is still -p3 ?