diff --git a/modules/sale_shipment_tolerance/sale.py b/modules/sale_shipment_tolerance/sale.py
index d454ba2930..8263ad5467 100644
--- a/modules/sale_shipment_tolerance/sale.py
+++ b/modules/sale_shipment_tolerance/sale.py
@@ -66,5 +66,7 @@ class Line(metaclass=PoolMeta):
                         name,
                         gettext('sale_shipment_tolerance.msg_over_shipment',
                             line=self.rec_name,
-                            shipped=lang.format_number(shipped_quantity),
-                            maximal=lang.format_number(maximal_quantity)))
+                            shipped=lang.format_number_symbol(
+                                shipped_quantity, self.unit),
+                            maximal=lang.format_number_symbol(
+                                maximal_quantity, self.unit)))