diff --git a/addons/account_tax_include/invoice_tax_incl.py b/addons/account_tax_include/invoice_tax_incl.py
index afe21383d64..2acca1eb815 100644
--- a/addons/account_tax_include/invoice_tax_incl.py
+++ b/addons/account_tax_include/invoice_tax_incl.py
@@ -122,7 +122,7 @@ class account_invoice_line(osv.osv):
         return {
                 'type':'src',
                 'name':line.name,
-                'price_unit':line.price_subtotal / line.quantity,
+                'price_unit':(line.quantity) and (line.price_subtotal / line.quantity) or line.price_subtotal,
                 'quantity':line.quantity,
                 'price':line.price_subtotal,
                 'account_id':line.account_id.id,