ip6tables -j LOG error

Hi. Running 64bit Wheezy, but with a self-compiled kernel.

This:

ip6tables -A INPUT -m limit --limit 3/min --limit-burst 10 -j LOG
--log-prefix "[INPUT6]: "

produces this:

ip6tables: No chain/target/match by that name.

When I get home I'll try rebooting into the standard kernel, just in
case that matters, but any pointers would be greatly appreciated.

Curt-