diff --git a/common/tpl/common_layout.html b/common/tpl/common_layout.html
index 2536b14d3..b9a5cf604 100644
--- a/common/tpl/common_layout.html
+++ b/common/tpl/common_layout.html
@@ -6,7 +6,7 @@
 	$js_files=Context::getJsFile();
 }
 <!DOCTYPE html>
-<html lang="{$lang_type}">
+<html lang="{str_replace('jp','ja',$lang_type)}">
 <head>
 <!-- META -->
 <meta charset="utf-8">
diff --git a/common/tpl/mobile_layout.html b/common/tpl/mobile_layout.html
index d639ad9ec..7bdeef77b 100644
--- a/common/tpl/mobile_layout.html
+++ b/common/tpl/mobile_layout.html
@@ -5,7 +5,7 @@
 	$js_files=Context::getJsFile();
 }
 <!DOCTYPE html>
-<html lang="{$lang_type}" class="xe-mobilelayout">
+<html lang="{str_replace('jp','ja',$lang_type)}" class="xe-mobilelayout">
 <head>
 <meta charset="utf-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no" />
