Disable IPv4 routing for routing-instance?

[asnoka <asnoka () gmail com>]

Hello list,
  Junos provice a method to disable isis ipv4 routing support like this:

isis {
        no-ipv4-routing; 
}

 However,we want to disable ipv4 routing for an VRF like that,is there
any method for us to do so?
 Thanks a lot.