Retirement tax questions

I am a retired ironworker and my local union started a pension supplement fund in which currently working members contribute to a supplemental pension fund to aid retired members. Each year retired members receive a 13th check from this pension supplement fund, not from the regular pension fund. I then get a 1099 Misc income form with this payment listed. Each year when I do my taxes with turbotax I am forced to list this as a business income and fill out all the appropriate forms. This is not right. Can someone help with this?