How to set parameters using RoundUp in a formula

I need to set a business process parameter C (integer) as the ceiling of A/B (both integer parameters).

I tried using the following formula:

RoundUp([#A#]/[#B#]) 

but when trying to save I receive this error:

Formula value error: No applicable method 'Ceiling' exists in type 'Math' (at index 5).

Is there anything I need to include in my business process to be able to use the RoundUp function? I already tried RoundOff and it returns the same error.