diff --git a/head.sub.php b/head.sub.php
index 59b191974..50917e9f7 100644
--- a/head.sub.php
+++ b/head.sub.php
@@ -81,7 +81,7 @@ if ($is_admin) {
 <script src="<?php echo G5_JS_URL ?>/wrest.js"></script>
 <?php
 if(G5_IS_MOBILE) {
-    echo '<script> set_cookie("device_width", screen.width, 6, g5_cookie_domain); </script>'.PHP_EOL;
+    echo '<script> set_cookie("device_width", $(window).width(), 6, g5_cookie_domain); </script>'.PHP_EOL;
     echo '<script src="'.G5_JS_URL.'/modernizr.custom.70111.js"></script>'.PHP_EOL; // overflow scroll 감지
 }
 //if(!defined('G5_IS_ADMIN'))