Adafruit motor shield reroute pin

Hello everyone,

I got my hands on an arduino uno, adafruit motor shield and usb host shield. But the problem is, that the two shields share one pin, pin 12. I was thinking of rerouting the pin to pin 2. My question is: what do I need to change in the AFMotor.h file to make it work? I've already tried something but I want to make sure that it works properly. Is it also necessary to change something in the AFMotor.cpp file?

What I think needs to be changed:

// Arduino pin names for interface to 74HCT595 latch
#define MOTORLATCH 12
#define MOTORCLK 4
#define MOTORDATA 8

I think MOTORLATCH 12 will be MOTORLATCH 2, am I correct?