diff --git a/core/src/com/unciv/logic/trade/TradeEvaluation.kt b/core/src/com/unciv/logic/trade/TradeEvaluation.kt
index 737ebafc19..ad7bd9e259 100644
--- a/core/src/com/unciv/logic/trade/TradeEvaluation.kt
+++ b/core/src/com/unciv/logic/trade/TradeEvaluation.kt
@@ -82,7 +82,7 @@ class TradeEvaluation {
         when (offer.type) {
             TradeType.Gold -> return offer.amount
             // GPT loses 1% of value for each 'future' turn, meaning: gold now is more valuable than gold in the future
-            TradeType.Gold_Per_Turn -> return (1..offer.duration).sumOf { (offer.amount * 0.99f.pow(offer.duration)).toInt() }
+            TradeType.Gold_Per_Turn -> return (1..offer.duration).sumOf { (offer.amount * 0.99f.pow(it)).toInt() }
             TradeType.Treaty -> {
                 return when (offer.name) {
                     // Since it will be evaluated twice, once when they evaluate our offer and once when they evaluate theirs