diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index 4953a083391..41f98fbea30 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -1077,7 +1077,7 @@ class PurchaseOrderLine(models.Model):
         # If not seller, use the standard price. It needs a proper currency conversion.
         if not seller:
             price_unit = self.env['account.tax']._fix_tax_included_price_company(
-                self.product_id.standard_price,
+                self.product_id.uom_id._compute_price(self.product_id.standard_price, self.product_id.uom_po_id),
                 self.product_id.supplier_taxes_id,
                 self.taxes_id,
                 self.company_id,