Dividing by Zero

I am trying to create a case statement that will allow me to divide by zero and then turn into a percent  I am wondering what else I need to do to make that happen.

CASE WHEN  Gross_Paid_Alae_YTD = 0  THEN 0 ELSE (AJO_PAID_Alae / Gross_Paid_Alae_YTD) END

Thanks!