diff --git a/account_move_line_purchase_info/tests/test_account_move_line_purchase_info.py b/account_move_line_purchase_info/tests/test_account_move_line_purchase_info.py
index de0b61a9..976ce07b 100644
--- a/account_move_line_purchase_info/tests/test_account_move_line_purchase_info.py
+++ b/account_move_line_purchase_info/tests/test_account_move_line_purchase_info.py
@@ -197,7 +197,7 @@ class TestAccountMoveLinePurchaseInfo(common.TransactionCase):
         f.partner_id = purchase.partner_id
         f.purchase_id = purchase
         invoice = f.save()
-        invoice.action_post()
+        invoice._post()
         purchase.flush()
 
         for aml in invoice.invoice_line_ids: