diff --git a/account_banking_sepa_direct_debit/models/account_payment_order.py b/account_banking_sepa_direct_debit/models/account_payment_order.py
index a365950fb..298d922e1 100644
--- a/account_banking_sepa_direct_debit/models/account_payment_order.py
+++ b/account_banking_sepa_direct_debit/models/account_payment_order.py
@@ -249,7 +249,7 @@ class AccountPaymentOrder(models.Model):
                 'recurrent_sequence_type': 'recurring',
                 })
             for first_mandate in first_mandates:
-                first_mandate.message_post(_(
+                first_mandate.message_post(body=_(
                     "Automatically switched from <b>First</b> to "
                     "<b>Recurring</b> when the debit order "
                     "<a href=# data-oe-model=account.payment.order "