diff --git a/js/util.js b/js/util.js
index 0c73f13..e555757 100644
--- a/js/util.js
+++ b/js/util.js
@@ -169,8 +169,7 @@ function addWithCapEfficiency(a, cap, strength = 2) {
 
 function sumGeometricSeries(base, rate, n, owned = 0) {
     base *= rate ** owned;
-    if (n == 1) return base;
-    return base * (1 - rate ** (n + 1)) / (1 - rate);
+    return base * (1 - rate ** n) / (1 - rate);
 }
 function maxGeometricSeries(base, rate, amount, owned = 0) {
     base *= rate ** owned;