diff --git a/classes/display/HTMLDisplayHandler.php b/classes/display/HTMLDisplayHandler.php
index 8023f74fa..22541f361 100644
--- a/classes/display/HTMLDisplayHandler.php
+++ b/classes/display/HTMLDisplayHandler.php
@@ -9,6 +9,11 @@ class HTMLDisplayHandler
 	const JQUERY_V1 = '1.12.4';
 	const JQUERY_V2 = '2.2.4';
 	
+	/**
+	 * Default viewport setting
+	 */
+	const DEFAULT_VIEWPORT = 'width=device-width, initial-scale=1.0, user-scalable=yes';
+	
 	/**
 	 * Reserved scripts
 	 */
diff --git a/common/tpl/common_layout.html b/common/tpl/common_layout.html
index 892d91e46..200be6a46 100644
--- a/common/tpl/common_layout.html
+++ b/common/tpl/common_layout.html
@@ -5,7 +5,9 @@
 <!-- META -->
 <meta charset="utf-8">
 <meta name="generator" content="Rhymix">
-<meta name="viewport" content="{config('mobile.viewport') ?: 'width=device-width, initial-scale=1.0, user-scalable=yes'}" cond="$m" />
+<!--@if(Mobile::isFromMobilePhone() && $__mv = config('mobile.viewport') ?? HTMLDisplayHandler::DEFAULT_VIEWPORT)-->
+<meta name="viewport" content="{$__mv}" />
+<!--@endif-->
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <block loop="Context::getMetaTag() => $no, $val">
 <meta http-equiv="{$val['name']}"|cond="$val['is_http_equiv']" name="{$val['name']}"|cond="!$val['is_http_equiv']" content="{$val['content']}" />
diff --git a/modules/admin/admin.admin.view.php b/modules/admin/admin.admin.view.php
index 10a1b3164..2a6f97d4d 100644
--- a/modules/admin/admin.admin.view.php
+++ b/modules/admin/admin.admin.view.php
@@ -549,7 +549,7 @@ class adminAdminView extends admin
 		Context::set('use_rewrite', Rhymix\Framework\Config::get('use_rewrite'));
 		Context::set('use_mobile_view', (config('mobile.enabled') !== null ? config('mobile.enabled') : config('use_mobile_view')) ? true : false);
 		Context::set('tablets_as_mobile', config('mobile.tablets') ? true : false);
-		Context::set('mobile_viewport', config('mobile.viewport') ?: 'width=device-width, initial-scale=1.0, user-scalable=yes');
+		Context::set('mobile_viewport', config('mobile.viewport') ?? HTMLDisplayHandler::DEFAULT_VIEWPORT);
 		Context::set('use_ssl', Rhymix\Framework\Config::get('url.ssl'));
 		Context::set('delay_session', Rhymix\Framework\Config::get('session.delay'));
 		Context::set('use_db_session', Rhymix\Framework\Config::get('session.use_db'));
diff --git a/modules/admin/lang/en.php b/modules/admin/lang/en.php
index 2649d5e7e..b9808e0e7 100644
--- a/modules/admin/lang/en.php
+++ b/modules/admin/lang/en.php
@@ -271,6 +271,7 @@ $lang->about_use_mobile_view = 'Show mobile page when visitors access with mobil
 $lang->tablets_as_mobile = 'Treat Tablets as Mobile';
 $lang->mobile_viewport = 'Mobile viewport Setting';
 $lang->about_mobile_viewport = 'The settings entered above will be output in a &lt;meta name=&quot;viewport&quot;&gt; tag for mobile visitors.';
+$lang->restore_default_viewport = 'Restore Default';
 $lang->thumbnail_target = 'Extract Thumbnail From';
 $lang->thumbnail_target_all = 'All images';
 $lang->thumbnail_target_attachment = 'Attached images only';
diff --git a/modules/admin/lang/ko.php b/modules/admin/lang/ko.php
index 7aa1e75f6..e82fa5ca4 100644
--- a/modules/admin/lang/ko.php
+++ b/modules/admin/lang/ko.php
@@ -267,6 +267,7 @@ $lang->about_use_mobile_view = '모바일 기기로 접속시 모바일 페이
 $lang->tablets_as_mobile = '태블릿도 모바일 취급';
 $lang->mobile_viewport = '모바일 viewport 설정';
 $lang->about_mobile_viewport = '모바일 접속시 여기 입력한 내용이 &lt;meta name=&quot;viewport&quot;&gt; 태그로 출력됩니다.';
+$lang->restore_default_viewport = '기본값 복원';
 $lang->thumbnail_target = '썸네일 생성 대상';
 $lang->thumbnail_target_all = '모든 이미지 (외부 이미지 포함)';
 $lang->thumbnail_target_attachment = '첨부된 이미지';
diff --git a/modules/admin/tpl/config_advanced.html b/modules/admin/tpl/config_advanced.html
index df1d9125f..ed96eb742 100644
--- a/modules/admin/tpl/config_advanced.html
+++ b/modules/admin/tpl/config_advanced.html
@@ -87,7 +87,7 @@
 			<label class="x_control-label" for="mobile_viewport">{$lang->mobile_viewport}</label>
 			<div class="x_controls">
 				<input type="text" name="mobile_viewport" id="mobile_viewport" value="{$mobile_viewport}" style="min-width: 80%" />
-				<p class="x_help-block">{$lang->about_mobile_viewport}</p>
+				<p class="x_help-block">{$lang->about_mobile_viewport} <a href="javascript:restoreDefaultViewport()">{$lang->restore_default_viewport}</a></p>
 			</div>
 		</div>
 		<div class="x_control-group">
@@ -222,3 +222,9 @@
 		</div>
 	</form>
 </section>
+
+<script>
+	function restoreDefaultViewport() {
+		$('#mobile_viewport').val({\HTMLDisplayHandler::DEFAULT_VIEWPORT|json|noescape});
+	}
+</script>
\ No newline at end of file