diff --git a/binaries/data/mods/public/simulation/ai/petra/tradeManager.js b/binaries/data/mods/public/simulation/ai/petra/tradeManager.js
index cd9c0c6031..07f0f5a9fe 100644
--- a/binaries/data/mods/public/simulation/ai/petra/tradeManager.js
+++ b/binaries/data/mods/public/simulation/ai/petra/tradeManager.js
@@ -292,8 +292,8 @@ m.TradeManager.prototype.performBarter = function(gameState)
 		if (buy === "food")
 			continue;
 		var barterRateMin = 80;
-		if (available["buy"] < 5000 && available["food"] > 5000)
-			barterRateMin -= (20 - Math.floor(available["buy"]/250));
+		if (available[buy] < 5000 && available["food"] > 5000)
+			barterRateMin -= (20 - Math.floor(available[buy]/250));
 		var barterRate = getBarterRate(prices, buy, "food");
 		if (barterRate < barterRateMin)
 			continue;