Index: wp-admin/includes/post.php
===================================================================
--- wp-admin/includes/post.php	(revision 21203)
+++ wp-admin/includes/post.php	(working copy)
@@ -1154,6 +1154,7 @@
 	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
 		$old_content_width = $content_width;
 		$content_width = 266;
+		$set_thumbnail_link = '<p class="hide-if-no-js"><a title="' . esc_attr__( 'Modify featured image' ) . '" href="%s" id="modify-post-thumbnail" class="thickbox">%s</a></p>';
 		if ( !isset( $_wp_additional_image_sizes['post-thumbnail'] ) )
 			$thumbnail_html = wp_get_attachment_image( $thumbnail_id, array( $content_width, $content_width ) );
 		else