diff --git a/addons/point_of_sale/pos.py b/addons/point_of_sale/pos.py
index 7c71436373d..f3ffec7ffc2 100644
--- a/addons/point_of_sale/pos.py
+++ b/addons/point_of_sale/pos.py
@@ -231,7 +231,7 @@ class pos_order(osv.osv):
 
     def test_paid(self, cr, uid, ids, context=None):
         def deci(val):
-            return Decimal(str(val))
+            return Decimal("%f" % (val, ))
 
         for order in self.browse(cr, uid, ids, context):
             if order.lines and not order.amount_total: