Index: wp-content/themes/twentythirteen/content-gallery.php
===================================================================
--- wp-content/themes/twentythirteen/content-gallery.php	(revision 24312)
+++ wp-content/themes/twentythirteen/content-gallery.php	(working copy)
@@ -20,7 +20,7 @@
 	</header><!-- .entry-header -->
 
 	<div class="entry-content">
-		<?php if ( is_single() ) : ?>
+		<?php if ( is_single() || ! get_post_gallery() ) : ?>
 			<?php the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentythirteen' ) ); ?>
 			<?php wp_link_pages( array( 'before' => '<div class="page-links"><span class="page-links-title">' . __( 'Pages:', 'twentythirteen' ) . '</span>', 'after' => '</div>', 'link_before' => '<span>', 'link_after' => '</span>' ) ); ?>
 		<?php else : ?>