diff --git a/adm/board_form.php b/adm/board_form.php
index 2f1cc8315..86f4cd5f2 100644
--- a/adm/board_form.php
+++ b/adm/board_form.php
@@ -206,7 +206,7 @@ $pg_anchor = '<ul class="anchor">
         <th scope="row"><label for="bo_mobile_subject">모바일 게시판 제목</label></th>
         <td colspan="2">
             <?php echo help("모바일에서 보여지는 게시판 제목이 다른 경우에 입력합니다. 입력이 없으면 기본 게시판 제목이 출력됩니다.") ?>
-            <input type="text" name="bo_mobile_subject" value="<?php echo get_text($board['bo_mobile_subject']) ?>" id="bo_mobile_subject" class="frm_input" maxlength="120">
+            <input type="text" name="bo_mobile_subject" value="<?php echo get_text($board['bo_mobile_subject']) ?>" id="bo_mobile_subject" class="frm_input" size="80" maxlength="120">
         </td>
     </tr>
     <tr>
diff --git a/install/gnuboard5.sql b/install/gnuboard5.sql
index a48a284fa..cc1a03e0d 100644
--- a/install/gnuboard5.sql
+++ b/install/gnuboard5.sql
@@ -23,6 +23,7 @@ CREATE TABLE IF NOT EXISTS `g5_board` (
   `bo_table` varchar(20) NOT NULL DEFAULT '',
   `gr_id` varchar(255) NOT NULL DEFAULT '',
   `bo_subject` varchar(255) NOT NULL DEFAULT '',
+  `bo_mobile_subject` varchar(255) NOT NULL DEFAULT '',
   `bo_device` enum('both','pc','mobile') NOT NULL DEFAULT 'both',
   `bo_admin` varchar(255) NOT NULL DEFAULT '',
   `bo_list_level` tinyint(4) NOT NULL DEFAULT '0',