diff --git a/sale.py b/sale.py
index a2beba65a9..09f7e99627 100644
--- a/sale.py
+++ b/sale.py
@@ -66,7 +66,7 @@ class Line(metaclass=PoolMeta):
                         name,
                         gettext('sale_shipment_tolerance.msg_over_shipment',
                             line=self.rec_name,
-                            shipped=lang.format(
-                                '%.*f', (self.unit.digits, shipped_quantity)),
-                            maximal=lang.format(
-                                '%.*f', (self.unit.digits, maximal_quantity))))
+                            shipped=lang.format_number(
+                                shipped_quantity, self.unit.digits),
+                            maximal=lang.format_number(
+                                maximal_quantity, self.unit.digits)))