Riak-cs-gc won't run

root@riakcs:~# riak-cs-gc status
There is no garbage collection in progress
  The current garbage collection interval is: 300
  Last run started at: undefined
  Next run scheduled for: 00440710T041127Z
root@riakcs:~# riak-cs-gc batch
Garbage collection batch started.
root@riakcs:~# riak-cs-gc status
There is no garbage collection in progress
  The current garbage collection interval is: 300
  Last run started at: undefined
  Next run scheduled for: 00440710T041225Z
root@riakcs:~#