Riemann Integrability of 1/f

I am studying for a qualifying exam and have come across this problem from a past exam. I would like to know how to complete it if anyone can help.

We have given as a Riemann integrable function whose values are all greater than 1, and must show that 1/*f* is also Riemann integrable.

I have shown the case when the original *f* is bounded, as Riemann integrability implies continuity almost everywhere, which carries to 1/*f* (which is also bounded) and is hence Riemann integrable.

But I cannot reckon the situation involving an unbounded *f* without appealing to the ugly partition definition of Riemann integrability. Is there a nicer way? I am inclined to think so because it's a qual problem designed to be completely solved in twenty minutes.