diff --git a/install/index.php b/install/index.php
index 056b399c0..990b5938a 100644
--- a/install/index.php
+++ b/install/index.php
@@ -1,4 +1,6 @@
 <?php
+@header('Content-Type: text/html; charset=utf-8');
+@header('X-Robots-Tag: noindex');
 include_once ('../config.php');
 $title = G5_VERSION." 라이센스 확인 1/3";
 include_once ('./install.inc.php');
diff --git a/install/install_config.php b/install/install_config.php
index 14d37fa5e..facb68255 100644
--- a/install/install_config.php
+++ b/install/install_config.php
@@ -5,6 +5,8 @@ header('Last-Modified: ' . $gmnow);
 header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
 header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
+@header('Content-Type: text/html; charset=utf-8');
+@header('X-Robots-Tag: noindex');
 
 include_once ('../config.php');
 $title = G5_VERSION." 초기환경설정 2/3";
diff --git a/install/install_db.php b/install/install_db.php
index b04985075..a6eed0e30 100644
--- a/install/install_db.php
+++ b/install/install_db.php
@@ -6,6 +6,8 @@ header('Last-Modified: ' . $gmnow);
 header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
 header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
+@header('Content-Type: text/html; charset=utf-8');
+@header('X-Robots-Tag: noindex');
 
 include_once ('../config.php');
 include_once ('../lib/common.lib.php');