diff --git a/base_user_role/models/role.py b/base_user_role/models/role.py
index 65d965224..fb03676ea 100644
--- a/base_user_role/models/role.py
+++ b/base_user_role/models/role.py
@@ -175,3 +175,11 @@ def unlink(self):
         res = super(ResUsersRoleLine, self).unlink()
         users.set_groups_from_roles(force=True)
         return res
+
+    @api.onchange('user_id')
+    def _onchange_user_id(self):
+        if self.user_id and self.user_id._is_admin():
+            return {'warning': {
+                'title': _("Warning"),
+                'message': _("When adding a role to an administrator, make sure no essential groups will be removed."),
+            }}