diff --git a/sale_margin_tax/models/sale_order_line.py b/sale_margin_tax/models/sale_order_line.py
index 1d95db9a..4d79286f 100644
--- a/sale_margin_tax/models/sale_order_line.py
+++ b/sale_margin_tax/models/sale_order_line.py
@@ -57,3 +57,7 @@ def _prepare_invoice_margin_base_line(self, **optional_values):
         }
         vals.update(base_values)
         return vals
+
+    def _get_invoice_lines(self):
+        res = super()._get_invoice_lines()
+        return res.filtered(lambda l: not l.is_margin_line)