diff --git a/wp-admin/network.php b/wp-admin/network.php
index cd277a5cd1..3cf02ce564 100644
--- a/wp-admin/network.php
+++ b/wp-admin/network.php
@@ -10,6 +10,8 @@
  * @subpackage Administration
  */
 
+define( 'WP_NETWORK_ADMIN_PAGE', true );
+
 /** WordPress Administration Bootstrap */
 require_once( './admin.php' );
 
diff --git a/wp-includes/l10n.php b/wp-includes/l10n.php
index f5dc9265b3..1ad9499b89 100644
--- a/wp-includes/l10n.php
+++ b/wp-includes/l10n.php
@@ -367,7 +367,7 @@ function load_default_textdomain() {
 
 	load_textdomain( 'default', WP_LANG_DIR . "/$locale.mo" );
 	
-	if ( is_multisite() || ( defined( 'WP_ALLOW_MULTISITE' ) && WP_ALLOW_MULTISITE ) ) {
+	if ( is_multisite() || ( defined( 'WP_NETWORK_ADMIN_PAGE' ) && WP_NETWORK_ADMIN_PAGE ) ) {
 		load_textdomain( 'default', WP_LANG_DIR . "/ms-$locale.mo" );
 	}
 }