diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 2bae3db21ff..1325f96d586 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -296,7 +296,7 @@ class Project(models.Model):
         tracking=True, index=True, copy=False, default=_default_stage_id, group_expand='_read_group_stage_ids')
 
     update_ids = fields.One2many('project.update', 'project_id')
-    last_update_id = fields.Many2one('project.update', string='Last Update')
+    last_update_id = fields.Many2one('project.update', string='Last Update', copy=False)
     last_update_status = fields.Selection(selection=[
         ('on_track', 'On Track'),
         ('at_risk', 'At Risk'),