diff --git a/bbs/register.php b/bbs/register.php
index 51aeedc0e..0ff1e36ed 100644
--- a/bbs/register.php
+++ b/bbs/register.php
@@ -9,10 +9,10 @@ if ($is_member) {
 // 세션을 지웁니다.
 set_session("ss_mb_reg", "");
 
-if ($g4['https_url']) {
-    $register_action_url = $g4['https_url'].'/'.$g4['bbs'].'/register_form.php';
+if (G4_HTTPS_URL) {
+    $register_action_url = G4_HTTPS_URL.'/bbs/register_form.php';
 } else {
-    $register_action_url = $g4['bbs_url'].'/register_form.php';
+    $register_action_url = G4_BBS_URL.'/register_form.php';
 }
 
 $g4['title'] = '회원가입약관';