diff --git a/addons/website/models/website_visitor.py b/addons/website/models/website_visitor.py
index 307ba256214..969e5a93685 100644
--- a/addons/website/models/website_visitor.py
+++ b/addons/website/models/website_visitor.py
@@ -106,7 +106,8 @@ class WebsiteVisitor(models.Model):
                 # If visitor does not exist
                 visitor_sudo = self._create_visitor(website_page.id)
                 sign = visitor_sudo._get_visitor_sign().get(visitor_sudo.id)
-                response.set_cookie('visitor_id', sign)
+                expiration_date = datetime.now() + timedelta(days=100*365)  # never expire
+                response.set_cookie('visitor_id', sign, expires=expiration_date.timestamp())
             else:
                 # Add page even if already in visitor_page_ids as checks on relations are done in many2many write method
                 vals = {
diff --git a/addons/website_livechat/models/website_visitor.py b/addons/website_livechat/models/website_visitor.py
index c27c002a99a..e4020760f8f 100644
--- a/addons/website_livechat/models/website_visitor.py
+++ b/addons/website_livechat/models/website_visitor.py
@@ -1,9 +1,11 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from datetime import datetime, timedelta
+import json
+
 from odoo import models, api, fields, _
 from odoo.exceptions import UserError
-import json
 
 
 class WebsiteVisitor(models.Model):
@@ -99,4 +101,5 @@ class WebsiteVisitor(models.Model):
                     "uuid": chat_request_channel.uuid,
                     "type": "chat_request"
                 })
-                response.set_cookie('im_livechat_session', livechat_session)
+                expiration_date = datetime.now() + timedelta(days=100*365)  # never expire
+                response.set_cookie('im_livechat_session', livechat_session, expires=expiration_date.timestamp())