diff --git a/trytond/trytond/modules/account_stock_landed_cost/account.py b/trytond/trytond/modules/account_stock_landed_cost/account.py
index 3815326..93478b1 100644
--- a/trytond/trytond/modules/account_stock_landed_cost/account.py
+++ b/trytond/trytond/modules/account_stock_landed_cost/account.py
@@ -10,11 +10,18 @@ from trytond.transaction import Transaction
 from trytond import backend
 from trytond.tools.multivalue import migrate_property
 from trytond.modules.company.model import CompanyValueMixin
+from trytond.modules.product import price_digits
 
 __all__ = ['Configuration', 'ConfigurationLandedCostSequence',
     'LandedCost', 'LandedCost_Shipment', 'InvoiceLine']


+def round_price(value, rounding=None):
+    "Round price using the price digits"
+    return value.quantize(
+        Decimal(1) / 10 ** price_digits[1], rounding=rounding)
+
+
 class Configuration(metaclass=PoolMeta):
     __name__ = 'account.configuration'
     landed_cost_sequence = fields.MultiValue(fields.Many2One(
@@ -244,8 +251,8 @@ class LandedCost(Workflow, ModelSQL, ModelView):
         for move in moves:
             quantity = Decimal(str(move.quantity))
             move_cost = cost * factors[move.id]
-            unit_landed_cost = (move_cost / quantity).quantize(exp,
-                rounding=ROUND_DOWN)
+            unit_landed_cost = round_price(
+                move_cost / quantity, rounding=ROUND_DOWN)
             costs.append({
                     'unit_landed_cost': unit_landed_cost,
                     'difference': move_cost - (unit_landed_cost * quantity),
@@ -267,8 +274,8 @@ class LandedCost(Workflow, ModelSQL, ModelView):
             unit_landed_cost = Currency.compute(
                 currency, cost['unit_landed_cost'],
                 move.currency, round=False)
-            unit_landed_cost = unit_landed_cost.quantize(
-                exp, rounding=ROUND_HALF_EVEN)
+            unit_landed_cost = round_price(
+                unit_landed_cost, rounding=ROUND_HALF_EVEN)
             if move.unit_landed_cost is None:
                 move.unit_landed_cost = 0
             move.unit_price += unit_landed_cost