diff --git a/docs/js/upgrade.js b/docs/js/upgrade.js
index b01cf9d..965fb4b 100644
--- a/docs/js/upgrade.js
+++ b/docs/js/upgrade.js
@@ -42,8 +42,7 @@ for (let upgrade of upgrades) {
 
         price = upgrade.price * (1.02 ** counts[upgrade.exec]);
 
-        nothingness -= price;
-        upgrade.price *= 1.02;
+        nothingness -= price / 1.02;
         updateText(button, price, upgrade.name, cc);
 
         exec[upgrade.exec]();