diff --git a/wp-admin/import-b2.php b/wp-admin/import-b2.php
index 28a84d5bb..93440255f 100644
--- a/wp-admin/import-b2.php
+++ b/wp-admin/import-b2.php
@@ -1,7 +1,7 @@
 <?php
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. Double check that you updated wp-config-sample.php with the proper database connection information and renamed it to wp-config.php.");
 require_once('../wp-config.php');
-require('upgrade-functions.php');
+require_once('upgrade-functions.php');
 $step = $_GET['step'];
 if (!$step) $step = 0;
 header( 'Content-Type: text/html; charset=utf-8' );
diff --git a/wp-admin/import-blogger.php b/wp-admin/import-blogger.php
index 928fdabf1..c573a3f06 100644
--- a/wp-admin/import-blogger.php
+++ b/wp-admin/import-blogger.php
@@ -16,7 +16,7 @@ for ($i=0; $i<count($wpvarstoreset); $i += 1) {
 	}
 }
 require_once('../wp-config.php');
-require('upgrade-functions.php');
+require_once('upgrade-functions.php');
 header( 'Content-Type: text/html; charset=utf-8' );
 switch ($action) {
 
diff --git a/wp-admin/import-greymatter.php b/wp-admin/import-greymatter.php
index fa743afb9..371671a79 100644
--- a/wp-admin/import-greymatter.php
+++ b/wp-admin/import-greymatter.php
@@ -2,7 +2,7 @@
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. You must install WordPress before you import any entries.");
 
 require_once('../wp-config.php');
-require('upgrade-functions.php');
+require_once('upgrade-functions.php');
 
 $wpvarstoreset = array('action', 'gmpath', 'archivespath', 'lastentry');
 for ($i=0; $i<count($wpvarstoreset); $i += 1) {
diff --git a/wp-admin/import-livejournal.php b/wp-admin/import-livejournal.php
index f3e137901..05326a751 100644
--- a/wp-admin/import-livejournal.php
+++ b/wp-admin/import-livejournal.php
@@ -13,7 +13,7 @@ $add_hours = intval($timezone_offset);
 $add_minutes = intval(60 * ($timezone_offset - $add_hours));
 
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. You must install WordPress before you import any entries.");
-require('../wp-config.php');
+require_once('../wp-config.php');
 
 $step = $_GET['step'];
 if (!$step) $step = 0;
diff --git a/wp-admin/import-mt.php b/wp-admin/import-mt.php
index 04d6ca0aa..a1e6f4821 100644
--- a/wp-admin/import-mt.php
+++ b/wp-admin/import-mt.php
@@ -4,8 +4,8 @@ define('MTEXPORT', '');
 //should be define('MTEXPORT', 'import.txt');
 
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. You must install WordPress before you import any entries.");
-require('../wp-config.php');
-require ('upgrade-functions.php');
+require_once('../wp-config.php');
+require_once('upgrade-functions.php');
 $step = $_GET['step'];
 if (!$step) $step = 0;
 header( 'Content-Type: text/html; charset=utf-8' );
diff --git a/wp-admin/import-rss.php b/wp-admin/import-rss.php
index 2c3efc956..2e3f49b80 100644
--- a/wp-admin/import-rss.php
+++ b/wp-admin/import-rss.php
@@ -18,7 +18,7 @@ $add_hours = intval($timezone_offset);
 $add_minutes = intval(60 * ($timezone_offset - $add_hours));
 
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. You must install WordPress before you import any entries.");
-require('../wp-config.php');
+require_once('../wp-config.php');
 
 $step = $_GET['step'];
 if (!$step) $step = 0;
diff --git a/wp-admin/import-textpattern.php b/wp-admin/import-textpattern.php
index b53ea2e71..0f5323fce 100644
--- a/wp-admin/import-textpattern.php
+++ b/wp-admin/import-textpattern.php
@@ -8,8 +8,8 @@ $tp_database_password = 'password';
 $tp_database_host = 'localhost';
 
 if (!file_exists('../wp-config.php')) die("There doesn't seem to be a wp-config.php file. Double check that you updated wp-config-sample.php with the proper database connection information and renamed it to wp-config.php.");
-require('../wp-config.php');
-require('upgrade-functions.php');
+require_once('../wp-config.php');
+require_once('upgrade-functions.php');
 
 $step = $_GET['step'];
 if (!$step) $step = 0;