diff --git a/src/engine/loot/WorkOrder.java b/src/engine/loot/WorkOrder.java
index 2871dd0d..b78604c7 100644
--- a/src/engine/loot/WorkOrder.java
+++ b/src/engine/loot/WorkOrder.java
@@ -174,7 +174,8 @@ public class WorkOrder implements Delayed {
         } else {
             int overflowAmount = workOrder.production_cost_total.get(mbEnums.ResourceType.GOLD) - strongbox;
             workOrder.vendor.building.setStrongboxValue(0);
-            modified_production_cost.put(mbEnums.ResourceType.GOLD, workOrder.production_cost_total.get(mbEnums.ResourceType.GOLD) - overflowAmount);
+            int adjustedAmount = workOrder.production_cost_total.get(mbEnums.ResourceType.GOLD) - overflowAmount;
+            modified_production_cost.put(mbEnums.ResourceType.GOLD, adjustedAmount);
         }
 
         // Deduct total production cost from warehouse