diff --git a/src/engine/gameManager/ForgeManager.java b/src/engine/gameManager/ForgeManager.java
index fc3b45b2..063bba1d 100644
--- a/src/engine/gameManager/ForgeManager.java
+++ b/src/engine/gameManager/ForgeManager.java
@@ -160,8 +160,7 @@ public enum ForgeManager implements Runnable {
             workOrder.total_to_produce *= workOrder.slots_used;
 
             workOrder.production_cost = calcProductionCost(workOrder);
-            workOrder.production_cost_total.putAll(workOrder.production_cost);
-            workOrder.production_cost_total.forEach((key, value) -> workOrder.production_cost_total.put(key, value * workOrder.total_to_produce));
+            workOrder.production_cost.forEach((key, value) -> workOrder.production_cost_total.put(key, value * workOrder.total_to_produce));
 
             // Withdraw gold and resource costs.  Availability has previously been validated.