diff --git a/wp-includes/feed-atom.php b/wp-includes/feed-atom.php
index f0d76ab9cd..f80f48f9d8 100644
--- a/wp-includes/feed-atom.php
+++ b/wp-includes/feed-atom.php
@@ -33,7 +33,7 @@ $more = 1;
 		<title type="<?php html_type_rss(); ?>"><![CDATA[<?php the_title_rss() ?>]]></title>
 		<link rel="alternate" type="text/html" href="<?php the_permalink_rss() ?>" />
 		<id><?php the_guid(); ?></id>
-		<updated><?php echo get_post_time('Y-m-d\TH:i:s\Z', true); ?></updated>
+		<updated><?php echo get_post_modified_time('Y-m-d\TH:i:s\Z', true); ?></updated>
 		<published><?php echo get_post_time('Y-m-d\TH:i:s\Z', true); ?></published>
 		<?php the_category_rss('atom') ?>
 		<summary type="<?php html_type_rss(); ?>"><![CDATA[<?php the_excerpt_rss(); ?>]]></summary>
@@ -44,4 +44,4 @@ $more = 1;
 <?php do_action('atom_entry'); ?>
 	</entry>
 	<?php endwhile ; ?>
-</feed>
\ No newline at end of file
+</feed>