diff --git a/addons/purchase/models/account_invoice.py b/addons/purchase/models/account_invoice.py
index 873921b322f..c140ada3bdd 100644
--- a/addons/purchase/models/account_invoice.py
+++ b/addons/purchase/models/account_invoice.py
@@ -156,7 +156,7 @@ class AccountInvoice(models.Model):
                             valuation_price_unit = valuation_price_unit_total / valuation_total_qty
                             valuation_price_unit = i_line.product_id.uom_id._compute_price(valuation_price_unit, i_line.uom_id)
                     if inv.currency_id.id != company_currency.id:
-                            valuation_price_unit = company_currency.with_context(date=inv.date_invoice).compute(valuation_price_unit, inv.currency_id)
+                            valuation_price_unit = company_currency.with_context(date=inv.date_invoice).compute(valuation_price_unit, inv.currency_id, round=False)
                     if valuation_price_unit != i_line.price_unit and line['price_unit'] == i_line.price_unit and acc:
                         # price with discount and without tax included
                         price_unit = i_line.price_unit * (1 - (i_line.discount or 0.0) / 100.0)