Index: wp-includes/admin-bar.php
--- wp-includes/admin-bar.php Base (BASE)
+++ wp-includes/admin-bar.php Locally Modified (Based On LOCAL)
@@ -275,8 +275,8 @@
 	if ( ! is_user_logged_in() || ! is_multisite() )
 		return;
 
-	// Show only when the user has at least one site, or they're a super admin.
-	if ( count( $wp_admin_bar->user->blogs ) < 1 && ! is_super_admin() )
+	// Show only when the user has more than one site, or they're a super admin.
+	if ( count( $wp_admin_bar->user->blogs ) <= 1 && ! is_super_admin() )
 		return;
 
 	$wp_admin_bar->add_menu( array(