diff --git a/odoo/addons/base/models/res_users.py b/odoo/addons/base/models/res_users.py
index 6c41d3a0789..0926c8dd922 100644
--- a/odoo/addons/base/models/res_users.py
+++ b/odoo/addons/base/models/res_users.py
@@ -237,7 +237,7 @@ class Users(models.Model):
         help="Specify a value only when creating a user or if you're "\
              "changing the user's password, otherwise leave empty. After "\
              "a change of password, the user has to login again.")
-    signature = fields.Html(string="Email Signature")
+    signature = fields.Html(string="Email Signature", default="")
     active = fields.Boolean(default=True)
     active_partner = fields.Boolean(related='partner_id.active', readonly=True, string="Partner is Active")
     action_id = fields.Many2one('ir.actions.actions', string='Home Action',