diff --git a/src/engine/gameManager/ForgeManager.java b/src/engine/gameManager/ForgeManager.java
index ad5799b8..05f1560f 100644
--- a/src/engine/gameManager/ForgeManager.java
+++ b/src/engine/gameManager/ForgeManager.java
@@ -105,8 +105,7 @@ public enum ForgeManager implements Runnable {
 
         // Set total cost for this production run
 
-        for (mbEnums.ResourceType resourceType : workOrder.production_cost.keySet())
-            workOrder.production_cost.compute(resourceType, (k, resourceValue) -> resourceValue * workOrder.total_to_produce);
+        workOrder.production_cost.forEach((key, value) -> workOrder.production_cost_total.compute(key, (k, v) -> v * workOrder.total_to_produce));
 
         // Single item rolls are total_to_produce of 0;