diff --git a/examples/signon.php b/examples/signon.php
index 314c3345a4..3d3dd0b0fa 100644
--- a/examples/signon.php
+++ b/examples/signon.php
@@ -32,7 +32,6 @@ if (isset($_POST['user'])) {
     /* Update another field of server configuration */
     $_SESSION['PMA_single_signon_cfgupdate'] = ['verbose' => 'Signon test'];
     $_SESSION['PMA_single_signon_HMAC_secret'] = hash('sha1', uniqid(strval(random_int(0, mt_getrandmax())), true));
-    $id = session_id();
     /* Close that session */
     @session_write_close();
     /* Redirect to phpMyAdmin (should use absolute URL here!) */