diff --git a/core/layout/blank.php b/core/layout/blank.php
index 962ed73b..eb12098b 100644
--- a/core/layout/blank.php
+++ b/core/layout/blank.php
@@ -2,6 +2,7 @@
 <html prefix="og: http://ogp.me/ns#" lang="<?php echo substr(self::$i18nContent, 0, 2); ?>">
 <head>
 	<meta charset="UTF-8">
+	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<?php $this->showMetaTitle(); ?>
 	<?php $this->showMetaDescription(); ?>
diff --git a/core/layout/light.php b/core/layout/light.php
index 4447176d..35b20a5e 100644
--- a/core/layout/light.php
+++ b/core/layout/light.php
@@ -2,6 +2,7 @@
 <html prefix="og: http://ogp.me/ns#" lang="<?php echo substr(self::$i18nContent, 0, 2); ?>">
 <head>
 	<meta charset="UTF-8">
+	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<?php $this->showMetaTitle(); ?>
 	<?php $this->showMetaDescription(); ?>
diff --git a/core/layout/mail.php b/core/layout/mail.php
index 4f214c00..b4b31b43 100644
--- a/core/layout/mail.php
+++ b/core/layout/mail.php
@@ -1,7 +1,8 @@
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml" lang="<?php echo substr(self::$i18nContent, 0, 2); ?>>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="<?php echo substr(self::$i18nContent, 0, 2);?>">
 <head>
 	<meta charset="utf-8">
+	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
 	<meta name="viewport" content="width=device-width">
 	<meta http-equiv="X-UA-Compatible" content="IE=edge">
 	<meta name="x-apple-disable-message-reformatting">
diff --git a/core/layout/main.php b/core/layout/main.php
index 449ae7a4..3dff8984 100644
--- a/core/layout/main.php
+++ b/core/layout/main.php
@@ -2,6 +2,7 @@
 <html prefix="og: http://ogp.me/ns#" lang="<?php echo substr(self::$i18nContent, 0, 2); ?>">
 <head>
 	<meta charset="UTF-8">
+	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<?php $this->showMetaTitle(); ?>
 	<?php $this->showMetaDescription(); ?>
