diff --git a/addons/utm/models/ir_http.py b/addons/utm/models/ir_http.py
index 6059b7b5d17..8f5405c13d2 100644
--- a/addons/utm/models/ir_http.py
+++ b/addons/utm/models/ir_http.py
@@ -1,7 +1,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo import models
-from odoo.http import request
+from odoo.http import request, Response
 
 
 class IrHttp(models.AbstractModel):
@@ -13,6 +13,8 @@ class IrHttp(models.AbstractModel):
 
     @classmethod
     def _set_utm(cls, response):
+        # Make sure response is an odoo Response.
+        response = Response.load(response)
         domain = cls.get_utm_domain_cookies()
         for url_parameter, __, cookie_name in request.env['utm.mixin'].tracking_fields():
             if url_parameter in request.params and request.httprequest.cookies.get(cookie_name) != request.params[url_parameter]: