diff --git a/account_credit_control/invoice.py b/account_credit_control/invoice.py
index d21fc9d71..078df90f4 100644
--- a/account_credit_control/invoice.py
+++ b/account_credit_control/invoice.py
@@ -49,7 +49,6 @@ class AccountInvoice(orm.Model):
             default = {}
         else:
             default = default.copy()
-        default = default.copy()
         default['credit_control_line_ids'] = False
         default['credit_policy_id'] = False
         return super(AccountInvoice, self).copy_data(