diff --git a/addons/account_voucher/account_voucher.py b/addons/account_voucher/account_voucher.py
index e4aa535083c..7e7cd9d6507 100644
--- a/addons/account_voucher/account_voucher.py
+++ b/addons/account_voucher/account_voucher.py
@@ -1343,7 +1343,7 @@ class account_voucher(osv.osv):
                 'date': voucher.date,
                 'credit': diff > 0 and diff or 0.0,
                 'debit': diff < 0 and -diff or 0.0,
-                'amount_currency': company_currency <> current_currency and (sign * -1 * voucher.writeoff_amount) or False,
+                'amount_currency': company_currency <> current_currency and (sign * -1 * voucher.writeoff_amount) or 0.0,
                 'currency_id': company_currency <> current_currency and current_currency or False,
                 'analytic_account_id': voucher.analytic_id and voucher.analytic_id.id or False,
             }