Cannot find bridge device with ifupdown

Please note that I am using Void Linux. Here is my /etc/network/interfaces.d/br0 file:

auto br0
iface br0 inet dhcp
    bridge_ports eth0
    bridge_stp off
        bridge_waitport 0
        bridge_fd 0

However on boot I get this error:

=> Bringing up the network
Internet Systems Consortium DHCP Client 4.4.2
Copyright 2004-2020 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/ 

Cannot find device "br0"
Failed to get interface index: No such device

If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug. These pages explain the proper
process and the information we find helpful for debugging.

exiting.
ifup: failed to bring up br0

I have confirmed that I have bridge-utils installed. I am at a loss for what the problem here is. I would appreciate help.