sysctl: setting key "net.ipv4.ip_forward": Invalid argument

This is a vanilla install. I just did a yum update to Centos 7.3 and install KvM and rebooted. When following a guide and setting up IP Forwarding like I always have done I get the following:

sysctl: setting key "net.ipv4.ip_forward": Invalid argument

I tried looking up on search engines but nothing definitive as shown up yet.

Does Installing KvM change the kernel and modules in someway I don't know about?

I check /proc/net and IPv4 is not there but I see IPv6. I do have an IPv4 address in my interfaces.

Ideas?