WordPress MU

I'm getting the following error in my dashboards across all blogs:

Fatal error: Call to undefined function: number_format_i18n() in /home/nolageek/public_html/wp-admin/index.php on line 46

Refferenced line in file is:

<?php if ( $numcomments ) : ?>
<p><strong><a href="moderation.php"><?php echo sprintf(__('Comments in moderation (%s)'), number_format_i18n($numcomments) ); ?> &raquo;</a></strong></p>
<?php endif; ?>

It seems that you have not upgraded the file wp-admin/index.php since the number_format_i18n() function on line 46 was replaced by number_format().