diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 26e2818b1d..78635778f2 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -1437,7 +1437,7 @@ function get_comment_reply_link( $args = array(), $comment = null, $post = null
 			$args['add_below'], $comment->comment_ID, $args['respond_id'], $post->ID
 		);
 
-		$link = sprintf( "<a class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
+		$link = sprintf( "<a rel='nofollow' class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
 			esc_url( add_query_arg( 'replytocom', $comment->comment_ID, get_permalink( $post->ID ) ) ) . "#" . $args['respond_id'],
 			$onclick,
 			esc_attr( sprintf( $args['reply_to_text'], $comment->comment_author ) ),