How do I remove hot spares from a storage pool in solaris zfs?

[petulia3478]

# zpool status test_pool
pool: test_pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
test_pool ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
spares
c1t3d0 AVAIL
c2t3d0 AVAIL

# zpool remove test_pool c2t3d0

# zpool status test_pool
pool: test_pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
test_pool ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
spares
c1t3d0 AVAIL

A hot spare cannot be removed if it is currently used by the storage pool.