diff --git a/include/client/header.inc.php b/include/client/header.inc.php
index 42b7b6c781fbd55834b77da9872ad1a4aebfe977..2e93d012db87de7f2fa984e12b6110dcef13be4b 100644
--- a/include/client/header.inc.php
+++ b/include/client/header.inc.php
@@ -28,7 +28,7 @@ if ($lang) {
     <title><?php echo Format::htmlchars($title); ?></title>
     <meta name="description" content="customer support platform">
     <meta name="keywords" content="osTicket, Customer support system, support ticket system">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 	<link rel="stylesheet" href="<?php echo ROOT_PATH; ?>css/osticket.css" media="screen">
     <link rel="stylesheet" href="<?php echo ASSETS_PATH; ?>css/theme.css" media="screen">
     <link rel="stylesheet" href="<?php echo ASSETS_PATH; ?>css/print.css" media="print">
diff --git a/include/staff/login.header.php b/include/staff/login.header.php
index d4068027840b811e2641f4870e6cd3927603e4f9..4460229c1acb8c2814128e343c9d0e861048abcc 100644
--- a/include/staff/login.header.php
+++ b/include/staff/login.header.php
@@ -12,7 +12,7 @@ defined('OSTSCPINC') or die('Invalid path');
     <meta name="robots" content="noindex" />
     <meta http-equiv="cache-control" content="no-cache" />
     <meta http-equiv="pragma" content="no-cache" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <script type="text/javascript" src="<?php echo ROOT_PATH; ?>js/jquery-1.11.2.min.js"></script>
     <script type="text/javascript">
         $(document).ready(function() {