/dev/vsock missing on the Slackware 14.2 VM guest

Hi guys, I have a problem with the missing /dev/vsock device on Slackware 14.2 virtual machine guest. I tried to append to the mkinitrd command vsock kernel module but this device isn't still present on the system. I also tried modprobe vsock but it still doesn't help. Any proposed solutions on how to make this device present? Some daemon needs /dev/vsock to work, and that's why I'm asking. I see /dev/vsock is already present on Slackware -current VM so maybe there's a missing package on Slackware 14.2.