diff --git a/interface.php b/interface.php
index 1a5521a..97500e8 100644
--- a/interface.php
+++ b/interface.php
@@ -47,7 +47,7 @@ if ((session_status() != PHP_SESSION_ACTIVE) || (!isset($_SESSION["nickname"]))
 $user_data = get_user($_SESSION["nickname"]);
 $nickname = $user_data["nickname"];
 $privilege = $user_data["privilege"];
-$is_quizmaster = $privilege === QUIZMASTER_NICKNAME;
+$is_quizmaster = $privilege === PRIVILEGE_QUIZMASTER;
 
 // login-requiring actions
 switch ($action) {