commit 2f5829fd2a7b704447aee4906117e4981326e9a5
Author: Shane Auckland <shane.auckland@gmail.com>
Date:   Tue May 7 20:25:36 2013 +0100

    1987418-new_changes

diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 42c20b0..ad26cf4 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -106,6 +106,7 @@ function user_theme() {
     ),
     'username' => array(
       'variables' => array('account' => NULL),
+      'template' => 'username',
     ),
   );
 }