diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index cbeb2325124..41d527436b5 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -576,7 +576,7 @@ class purchase_order(osv.osv):
                     todo.append(line.id)        
         self.pool.get('purchase.order.line').action_confirm(cr, uid, todo, context)
         for id in ids:
-            self.write(cr, uid, [id], {'state' : 'confirmed', 'validator' : uid})
+            self.write(cr, uid, [id], {'state' : 'confirmed', 'validator' : uid}, context=context)
         return True
 
     def _choose_account_from_po_line(self, cr, uid, po_line, context=None):