Is it possible to force OS X to use 40Mhz Channels?

So Apple prevents the use of 40 Mhz wide Wifi channels at 2.4 ghz to prevent interference with bluetooth. My router is already broadcasting at 40 Mhz, is it possible to force OS X to use the wide channel with some sort of hack/tweak?

I have an early 2014 Macbook Air.