Ticket #23942: 23942.patch

wp-content/themes/twentythirteen/content-image.php

@@ -10 +10 @@
 
 <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
         <div class="entry-media">
-                <?php the_image( 'twentythirteen-image-post' ); ?>
+                <?php the_post_format_image( 'twentythirteen-image-post' ); ?>
         </div><!-- .entry-media -->
 
         <header class="entry-header">