diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index ee4d64fe631..ab20bd31081 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -454,7 +454,7 @@ class PurchaseOrder(models.Model):
         pick_ids = self.mapped('picking_ids')
         #choose the view_mode accordingly
         if len(pick_ids) > 1:
-            result['domain'] = "[('id','in',%s])]" % (pick_ids.ids)
+            result['domain'] = "[('id','in',%s)]" % (pick_ids.ids)
         elif len(pick_ids) == 1:
             res = self.env.ref('stock.view_picking_form', False)
             result['views'] = [(res and res.id or False, 'form')]