diff --git a/kfet/templatetags/kfet_tags.py b/kfet/templatetags/kfet_tags.py
index f27f590e..66152dfe 100644
--- a/kfet/templatetags/kfet_tags.py
+++ b/kfet/templatetags/kfet_tags.py
@@ -38,4 +38,5 @@ def highlight_clipper(clipper, q):
 @register.filter()
 def ukf(balance, is_cof):
     grant = is_cof and (1 + Settings.SUBVENTION_COF() / 100) or 1
-    return floor(balance * 10 * grant)
+    # float nécessaire car sinon problème avec le round de future.builtins
+    return floor(float(balance) * 10 * grant)
diff --git a/kfet/views.py b/kfet/views.py
index 7083d489..125ce9b1 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -963,7 +963,7 @@ def kpsul_perform_operations(request):
             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
+                operation.amount = Decimal(float(operation.amount) / cof_grant_divisor)
             to_articles_stocks[operation.article] -= operation.article_nb
         else:
             if operationgroup.on_acc.is_cash: