diff --git a/odoo/addons/base/models/ir_model.py b/odoo/addons/base/models/ir_model.py
index 5b5d9bb99d9..a0e58627147 100644
--- a/odoo/addons/base/models/ir_model.py
+++ b/odoo/addons/base/models/ir_model.py
@@ -1624,7 +1624,7 @@ class IrModelAccess(models.Model):
     name = fields.Char(required=True, index=True)
     active = fields.Boolean(default=True, help='If you uncheck the active field, it will disable the ACL without deleting it (if you delete a native ACL, it will be re-created when you reload the module).')
     model_id = fields.Many2one('ir.model', string='Model', required=True, index=True, ondelete='cascade')
-    group_id = fields.Many2one('res.groups', string='Group', ondelete='cascade', index=True)
+    group_id = fields.Many2one('res.groups', string='Group', ondelete='restrict', index=True)
     perm_read = fields.Boolean(string='Read Access')
     perm_write = fields.Boolean(string='Write Access')
     perm_create = fields.Boolean(string='Create Access')
diff --git a/odoo/addons/base/models/ir_rule.py b/odoo/addons/base/models/ir_rule.py
index 519468f63c7..025f65437d6 100644
--- a/odoo/addons/base/models/ir_rule.py
+++ b/odoo/addons/base/models/ir_rule.py
@@ -20,7 +20,7 @@ class IrRule(models.Model):
     name = fields.Char(index=True)
     active = fields.Boolean(default=True, help="If you uncheck the active field, it will disable the record rule without deleting it (if you delete a native record rule, it may be re-created when you reload the module).")
     model_id = fields.Many2one('ir.model', string='Model', index=True, required=True, ondelete="cascade")
-    groups = fields.Many2many('res.groups', 'rule_group_rel', 'rule_group_id', 'group_id')
+    groups = fields.Many2many('res.groups', 'rule_group_rel', 'rule_group_id', 'group_id', ondelete='restrict')
     domain_force = fields.Text(string='Domain')
     perm_read = fields.Boolean(string='Apply for Read', default=True)
     perm_write = fields.Boolean(string='Apply for Write', default=True)