diff --git a/sale_triple_discount/models/sale_order_line.py b/sale_triple_discount/models/sale_order_line.py
index a23b3e3d2cf5..cb41d46f9f24 100644
--- a/sale_triple_discount/models/sale_order_line.py
+++ b/sale_triple_discount/models/sale_order_line.py
@@ -103,6 +103,9 @@ def triple_discount_preprocess(self):
         Updating the cache provides consistency through re-computations."""
         prev_values = dict()
         self.invalidate_cache(fnames=self._discount_fields(), ids=self.ids)
+        digits = self._fields["discount"]._digits
+        self.env["sale.order.line"]._fields["discount"]._digits = (16, 16)
+        prev_values["discount_digits"] = digits
         for line in self:
             prev_values[line] = {
                 fname: line[fname] for fname in self._discount_fields()
@@ -122,6 +125,8 @@ def triple_discount_postprocess(self, prev_values):
             fnames=self._discount_fields(),
             ids=[line.id for line in list(prev_values.keys())],
         )
+        digits = prev_values.pop("discount_digits")
+        self.env["sale.order.line"]._fields["discount"]._digits = digits
         for line, prev_vals_dict in list(prev_values.items()):
             line.update(prev_vals_dict)
 
diff --git a/sale_triple_discount/tests/test_sale_triple_discount.py b/sale_triple_discount/tests/test_sale_triple_discount.py
index 069e796cb1e2..199673bbc848 100644
--- a/sale_triple_discount/tests/test_sale_triple_discount.py
+++ b/sale_triple_discount/tests/test_sale_triple_discount.py
@@ -208,3 +208,11 @@ def test_06_discount_0(self):
         self.assertAlmostEqual(self.so_line2.price_subtotal, 600.0)
         self.assertAlmostEqual(self.order.amount_untaxed, 1200.0)
         self.assertAlmostEqual(self.order.amount_tax, 180.0)
+
+    def test_07_discount_16_digits(self):
+        self.so_line1.product_uom_qty = 2.0
+        self.so_line1.price_unit = 138.0
+        self.so_line1.discount = 45.0
+        self.so_line1.discount2 = 5.0
+        self.so_line1.discount3 = 10.0
+        self.assertAlmostEqual(self.so_line1.price_subtotal, 129.79)