diff --git a/kfet/forms.py b/kfet/forms.py
index acab8df6..05c09e79 100644
--- a/kfet/forms.py
+++ b/kfet/forms.py
@@ -396,7 +396,6 @@ class SettingsForm(forms.ModelForm):
                 raise ValidationError('Renseignez une durée')
             self.cleaned_data['value_decimal'] = None
             self.cleaned_data['value_account'] = None
-        cache.delete(name)
         super(SettingsForm, self).clean()
 
 class FilterHistoryForm(forms.Form):
diff --git a/kfet/models.py b/kfet/models.py
index bbebd3e3..5e333b76 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -672,8 +672,8 @@ class Settings(models.Model):
     @staticmethod
     def empty_cache():
         cache.delete_many([
-            'SUBVENTION_COF','OVERDRAFT_DURATION', 'OVERDRAFT_AMOUNT',
-            'CANCEL_DURATION',
+            'SUBVENTION_COF', 'OVERDRAFT_DURATION', 'OVERDRAFT_AMOUNT',
+            'CANCEL_DURATION', 'ADDCOST_AMOUNT', 'ADDCOST_FOR',
         ])
 
 class GenericTeamToken(models.Model):