diff --git a/job.go b/job.go
index 908b302..b56928f 100644
--- a/job.go
+++ b/job.go
@@ -1834,7 +1834,7 @@ func jobCraftItem(j Job) {
 				logOnError(err, "jobCraftItem : getObjItem")
 				if obj.Craft != nil {
 					craftItems[code] = req - ava
-					totalMana = (req - ava) * obj.Craft.Mana
+					totalMana = totalMana + (req-ava)*obj.Craft.Mana
 					for _, v := range obj.Craft.Items {
 						req2, _ := requiredItems[v.Code]
 						requiredItems[v.Code] = req2 + v.Quantity*(req-ava)