diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index 8bab265ae3b..6f4d38685a6 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -475,7 +475,7 @@ class sale_order(osv.osv):
                 return False
         return True
 
-    def action_invoice_create(self, cr, uid, ids, grouped=False, states=None, date_inv = False, context=None):
+    def action_invoice_create(self, cr, uid, ids, grouped=False, states=None, date_invoice = False, context=None):
         if states is None:
             states = ['confirmed', 'done', 'exception']
         res = False
@@ -488,8 +488,8 @@ class sale_order(osv.osv):
             context = {}
         # If date was specified, use it as date invoiced, usefull when invoices are generated this month and put the
         # last day of the last month as invoice date
-        if date_inv:
-            context['date_inv'] = date_inv
+        if date_invoice:
+            context['date_invoice'] = date_invoice
         for o in self.browse(cr, uid, ids, context=context):
             currency_id = o.pricelist_id.currency_id.id
             if (o.partner_id.id in partner_currency) and (partner_currency[o.partner_id.id] <> currency_id):