diff --git a/addons/purchase/models/account_invoice.py b/addons/purchase/models/account_invoice.py
index 8897f16e565..f7d75dc326f 100644
--- a/addons/purchase/models/account_invoice.py
+++ b/addons/purchase/models/account_invoice.py
@@ -67,7 +67,7 @@ class AccountMove(models.Model):
             )
 
         # Compute invoice_origin.
-        origins = set(self.line_ids.mapped('purchase_line_id.order_id.name'))
+        origins = set(self.invoice_line_ids.mapped('purchase_line_id.order_id.name'))
         self.invoice_origin = ','.join(list(origins))
 
         # Compute ref.