diff --git a/wp-admin/admin-header.php b/wp-admin/admin-header.php
index 9f84960f1..6f9b46d1c 100644
--- a/wp-admin/admin-header.php
+++ b/wp-admin/admin-header.php
@@ -49,9 +49,9 @@ do_action('admin_head');
 <div id="user_info"><p><?php printf(__('Howdy, <strong>%s</strong>.'), $user_identity) ?> [<a href="<?php echo get_option('siteurl'); ?>/wp-login.php?action=logout" title="<?php _e('Log out of this account') ?>"><?php _e('Sign Out'); ?></a>, <a href="profile.php"><?php _e('My Profile'); ?></a>] </p></div>
 
 <?php
-require(ABSPATH . '/wp-admin/menu-header.php');
+require(ABSPATH . 'wp-admin/menu-header.php');
 
 if ( $parent_file == 'options-general.php' ) {
-	require(ABSPATH . '/wp-admin/options-head.php');
+	require(ABSPATH . 'wp-admin/options-head.php');
 }
 ?>
diff --git a/wp-admin/admin.php b/wp-admin/admin.php
index ac4c801df..2248be496 100644
--- a/wp-admin/admin.php
+++ b/wp-admin/admin.php
@@ -35,7 +35,7 @@ if (isset($_GET['page'])) {
 	$plugin_page = plugin_basename($plugin_page);
 }
 
-require(ABSPATH . '/wp-admin/menu.php');
+require(ABSPATH . 'wp-admin/menu.php');
 
 // Handle plugin admin pages.
 if (isset($plugin_page)) {
@@ -44,7 +44,7 @@ if (isset($plugin_page)) {
 	if ( $page_hook ) {
 		do_action('load-' . $page_hook);
 		if (! isset($_GET['noheader']))
-			require_once(ABSPATH . '/wp-admin/admin-header.php');
+			require_once(ABSPATH . 'wp-admin/admin-header.php');
 
 		do_action($page_hook);
 	} else {
@@ -58,7 +58,7 @@ if (isset($plugin_page)) {
 		do_action('load-' . $plugin_page);
 
 		if (! isset($_GET['noheader']))
-			require_once(ABSPATH . '/wp-admin/admin-header.php');
+			require_once(ABSPATH . 'wp-admin/admin-header.php');
 
 		include(ABSPATH . PLUGINDIR . "/$plugin_page");
 	}
diff --git a/wp-admin/import/mt.php b/wp-admin/import/mt.php
index 8ee9c3972..a2b690402 100644
--- a/wp-admin/import/mt.php
+++ b/wp-admin/import/mt.php
@@ -177,7 +177,7 @@ class MT_Import {
 
 	function select_authors() {
 		if ( $_POST['upload_type'] === 'ftp' ) {
-			$file['file'] = ABSPATH . '/wp-content/mt-export.txt';
+			$file['file'] = ABSPATH . 'wp-content/mt-export.txt';
 			if ( !file_exists($file['file']) )
 				$file['error'] = __('<code>mt-export.txt</code> does not exist</code>');
 		} else {
@@ -411,7 +411,7 @@ class MT_Import {
 	function import() {
 		$this->id = (int) $_GET['id'];
 		if ( $this->id == 0 )
-			$this->file = ABSPATH . '/wp-content/mt-export.txt';
+			$this->file = ABSPATH . 'wp-content/mt-export.txt';
 		else
 			$this->file = get_attached_file($this->id);
 		$this->get_authors_from_post();
diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index 8db4c9d6d..e51b0e428 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -2,8 +2,8 @@
 
 if ( file_exists(ABSPATH . 'wp-content/install.php') )
 	require (ABSPATH . 'wp-content/install.php');
-require_once(ABSPATH . '/wp-admin/includes/admin.php');
-require_once(ABSPATH . '/wp-admin/includes/schema.php');
+require_once(ABSPATH . 'wp-admin/includes/admin.php');
+require_once(ABSPATH . 'wp-admin/includes/schema.php');
 
 if ( !function_exists('wp_install') ) :
 function wp_install($blog_title, $user_name, $user_email, $public, $meta='') {
diff --git a/wp-admin/upgrade.php b/wp-admin/upgrade.php
index d2f30c4ec..f367f03b9 100644
--- a/wp-admin/upgrade.php
+++ b/wp-admin/upgrade.php
@@ -5,7 +5,7 @@ if (!file_exists('../wp-config.php'))
 
 require('../wp-config.php');
 timer_start();
-require_once(ABSPATH . '/wp-admin/includes/upgrade.php');
+require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
 
 if (isset($_GET['step']))
 	$step = (int) $_GET['step'];
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 6a9123e0d..150a10a88 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -485,7 +485,7 @@ function do_enclose( $content, $post_ID ) {
 	global $wp_version, $wpdb;
 	include_once (ABSPATH . WPINC . '/class-IXR.php');
 
-	$log = debug_fopen(ABSPATH . '/enclosures.log', 'a');
+	$log = debug_fopen(ABSPATH . 'enclosures.log', 'a');
 	$post_links = array();
 	debug_fwrite($log, 'BEGIN '.date('YmdHis', time())."\n");
 
diff --git a/wp-includes/template-loader.php b/wp-includes/template-loader.php
index 80ba5dc33..0c5a671c8 100644
--- a/wp-includes/template-loader.php
+++ b/wp-includes/template-loader.php
@@ -8,7 +8,7 @@ if ( defined('WP_USE_THEMES') && constant('WP_USE_THEMES') ) {
 		do_feed();
 		return;
 	} else if ( is_trackback() ) {
-		include(ABSPATH . '/wp-trackback.php');
+		include(ABSPATH . 'wp-trackback.php');
 		return;
 	} else if ( is_404() && $template = get_404_template() ) {
 		include($template);
@@ -68,7 +68,7 @@ if ( defined('WP_USE_THEMES') && constant('WP_USE_THEMES') ) {
 		do_feed();
 		return;
 	} else if ( is_trackback() ) {
-		include(ABSPATH . '/wp-trackback.php');
+		include(ABSPATH . 'wp-trackback.php');
 		return;
 	}
 }
diff --git a/wp-settings.php b/wp-settings.php
index e73c1fd4f..e23c2d018 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -196,8 +196,8 @@ require (ABSPATH . WPINC . '/vars.php');
 
 // Check for hacks file if the option is enabled
 if (get_option('hack_file')) {
-	if (file_exists(ABSPATH . '/my-hacks.php'))
-		require(ABSPATH . '/my-hacks.php');
+	if (file_exists(ABSPATH . 'my-hacks.php'))
+		require(ABSPATH . 'my-hacks.php');
 }
 
 if ( get_option('active_plugins') ) {