Webmin fails when updating IPtables on OpenVZ machine

Using Webmin to create the default IPtables setup for "Virtual Hosting Machine" I get the following error when I try to apply it:

Failed to apply configuration :

Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: iptables-restore: line 61 failed
Warning: wierd character in interface `venet0:0' (No aliases, :, ! or *).
[FAILED]

I also tried it using venet0 and basically got a similar response:

Failed to apply configuration :

Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: iptables-restore: line 61 failed
[FAILED]