diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index 84b433adda6..7cd132ff93c 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -128,7 +128,7 @@ class sale_order(osv.osv):
                 if invoice.state not in ('draft','cancel'):
                     tot += invoice.amount_untaxed
             if tot:
-                res[sale.id] = tot * 100.0 / sale.amount_untaxed
+                res[sale.id] = min(100.0,tot * 100.0 / sale.amount_untaxed)
             else:
                 res[sale.id] = 0.0
         return res