diff --git a/kfet/views.py b/kfet/views.py
index 68d4bb13..ac8afcb8 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -621,6 +621,8 @@ def kpsul_perform_operations(request):
             if operationgroup.on_acc.is_cash:
                 to_checkout_balance += -operation.amount
             if operationgroup.on_acc.is_cof:
+                if is_addcost:
+                    operation.addcost_amount = operation.addcost_amount / cof_grant_divisor
                 operation.amount = operation.amount / cof_grant_divisor
             to_articles_stocks[operation.article] -= operation.article_nb
         else:
@@ -630,6 +632,8 @@ def kpsul_perform_operations(request):
         operationgroup.amount += operation.amount
         if operation.type == Operation.DEPOSIT:
             required_perms.add('kfet.perform_deposit')
+    if operationgroup.on_acc.is_cof:
+        to_addcost_for_balance = to_addcost_for_balance / cof_grant_divisor
 
     (perms, stop) = operationgroup.on_acc.perms_to_perform_operation(
             amount = operationgroup.amount)