diff --git a/addons/crm/models/crm_lead.py b/addons/crm/models/crm_lead.py
index 017847c0371..22d3eb6670d 100644
--- a/addons/crm/models/crm_lead.py
+++ b/addons/crm/models/crm_lead.py
@@ -100,7 +100,7 @@ class Lead(FormatAddress, models.Model):
     user_id = fields.Many2one('res.users', string='Salesperson', index=True, track_visibility='onchange', default=lambda self: self.env.user)
     referred = fields.Char('Referred By')
 
-    date_open = fields.Datetime('Assigned', readonly=True, default=fields.Datetime.now)
+    date_open = fields.Datetime('Assigned', readonly=True, default=lambda self: fields.Datetime.now())
     day_open = fields.Float(compute='_compute_day_open', string='Days to Assign', store=True)
     day_close = fields.Float(compute='_compute_day_close', string='Days to Close', store=True)
     date_last_stage_update = fields.Datetime(string='Last Stage Update', index=True, default=fields.Datetime.now)