Discouraging Pet Rabbit Using Patio as its Bathroom

We have a pet rabbit that is a one year old female, it free ranges a small yard with some chickens.  In the last couple of months it has started using our covered tiled patio as its personal bathroom.  This and has become a real nuissance as we frequently use this area and the urine is staining the tiles.  

I have tried chili flakes to deter it, but they seemed to have no effect.  

Any ideas on how to deter it from this area or make another area more appealing?

A high powered bb gun works well for chasing away chickens. Maybe a low powered one would work for rabbits. Pavlov can work wonders. If you don't want to use bb's, maybe keeping a hose ready to spray would have the same effect. Spray or shoot the rabbits every single time they transgress will teach them quickly.