How can I remove a personal tag?

[H.J. Lu]

I want to update users/hjl/linux/release/2.26.51.0.1 tag by
removing it fist.  I got

# git push origin  :users/hjl/linux/release/2.26.51.0.1
remote: *** Deleting a tag is not allowed in this repository
remote: error: hook declined to update
refs/tags/users/hjl/linux/release/2.26.51.0.1
Auto packing the repository for optimum performance.
warning: There are too many unreachable loose objects; run 'git prune'
to remove them.
To ssh://hjl@sourceware.org/git/binutils-gdb.git
 ! [remote rejected] users/hjl/linux/release/2.26.51.0.1 (hook declined)
error: failed to push some refs to
'ssh://hjl@sourceware.org/git/binutils-gdb.git'


-- 
H.J.