Resistors do not have a voltage but rather a current rating, In this case
an 1/8 watt would probably work. A 1/4 watt is more than adequate unless there is a short somewhere that would draw more current. Highly unlikely though and if so it will burn and protect the circuit A larger watt rating ( 1/2 to 1 watt) will have no effect on the the result.

keep us posted