Prevent Visual Studio generating async methods for WCF callback

Question

I have a WCF Service that uses a callback.

Using the "Configure Service Reference..." I can tell it to generate me async implementations.

The problem is it will also generate me an async callback which I do not want because I then have to implement it manually which is complicated.

Is there a way to just generate the asnyc client for the outbound service calls, and not the callback interface?