diff --git a/runbot/models/docker.py b/runbot/models/docker.py
index c61971a9..cc4622f9 100644
--- a/runbot/models/docker.py
+++ b/runbot/models/docker.py
@@ -128,7 +128,7 @@ class Dockerfile(models.Model):
     arch_base = fields.Text(related='template_id.arch_base', readonly=False, related_sudo=True)
     dockerfile = fields.Text(compute='_compute_dockerfile', tracking=True)
     to_build = fields.Boolean('To Build', help='Build Dockerfile. Check this when the Dockerfile is ready.', default=False)
-    always_pull = fields.Boolean('Always pull', help='Always Pull on the hosts, not only at the use time', default=False, tracking=True)
+    always_pull = fields.Boolean('Always pull', help='Always Pull on the hosts, not only at the use time', default=False, tracking=True, copy=False)
     version_ids = fields.One2many('runbot.version', 'dockerfile_id', string='Versions')
     description = fields.Text('Description')
     view_ids = fields.Many2many('ir.ui.view', compute='_compute_view_ids', groups="runbot.group_runbot_admin")