Does not keeping a promise violate the precept on lying? What if I promised myself?

In my opinion, if you promise something to someone and don't keep it, it is equivalent to lying. But what if the promise is to myself and I don't keep it; is it violating the precept on lying? Does the lying precept apply to oneself, i.e not lying to yourself? Sutta / Vinaya references would be very much appreciated. Edit: I meant one vowed/ promised with honest intention at the time did it, but later change mind and don't want to keep it anymore