Subtract 1 month from the date expire for a task

I have a column that calculates a due date that uses this simple formula:

=DATE(YEAR([Date Expired]@row), MONTH([Date Expired]@row) - 1, DAY([Date Expired]@row))

It works great but for some reason returns #INVALID VALUE when the date expired is any day in January. any other month seems to be fine I'm guessing because the month prior is in a prior year. what argument will fix this?