diff --git a/wp-includes/load.php b/wp-includes/load.php
index 06a6ad9b74..826c137684 100644
--- a/wp-includes/load.php
+++ b/wp-includes/load.php
@@ -38,6 +38,14 @@ function wp_unregister_GLOBALS() {
  */
 function wp_fix_server_vars() {
 	global $PHP_SELF;
+	
+	$default_server_values = array(
+		'SERVER_SOFTWARE' => '',
+		'REQUEST_URI' => '',
+	);
+
+	$_SERVER = array_merge( $default_server_values, $_SERVER );
+	
 	// Fix for IIS when running with PHP ISAPI
 	if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {