Allow me to set Goal widget tracker currency to USD.

Currently when I get a donation in usd the goal tracker adds the numbers to it AFTER the ammount is converted to my local currency - I get a 1 dollar but the tracker shows 3.60$ (as this is dollar rate to PLN). I just want the widget to show the amount of money I got before te conversion. So I get 1 dollar and I want it to show 1 dollar.