diff --git a/src/wp-content/themes/twentyfifteen/inc/template-tags.php b/src/wp-content/themes/twentyfifteen/inc/template-tags.php
index a3a9f4cb4e..0a9c439022 100644
--- a/src/wp-content/themes/twentyfifteen/inc/template-tags.php
+++ b/src/wp-content/themes/twentyfifteen/inc/template-tags.php
@@ -193,8 +193,10 @@ function twentyfifteen_post_thumbnail() {
 
 	<?php else : ?>
 
-	<a class="post-thumbnail" href="<?php the_permalink(); ?>">
-		<?php the_post_thumbnail(); ?>
+	<a class="post-thumbnail" href="<?php the_permalink(); ?>" aria-hidden="true">
+		<?php
+			the_post_thumbnail( 'post-thumbnail', array( 'alt'=>get_the_title() ) ); 
+		?>
 	</a>
 
 	<?php endif; // End is_singular()