What sort of pension is it? Was it a lump sum that you received? You might consider putting it into an immediate annuity that would give you a monthly income for the rest of your life.
I didn't know a pension fund could run low. I have 3 small pensions from previous employers and I will get a set amount monthly for the rest of my life. I don't have to do anything but add it into my deposit list in my Check book.