diff --git a/wp-includes/default-widgets.php b/wp-includes/default-widgets.php
index 85a796e194..ddd9d8ac63 100644
--- a/wp-includes/default-widgets.php
+++ b/wp-includes/default-widgets.php
@@ -686,6 +686,10 @@ class WP_Widget_Recent_Comments extends WP_Widget {
 
 		$output .= '<ul id="recentcomments">';
 		if ( $comments ) {
+			// Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
+			$post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
+			_prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );
+
 			foreach ( (array) $comments as $comment) {
 				$output .=  '<li class="recentcomments">' . /* translators: comments widget: 1: comment author, 2: post link */ sprintf(_x('%1$s on %2$s', 'widgets'), get_comment_author_link(), '<a href="' . esc_url( get_comment_link($comment->comment_ID) ) . '">' . get_the_title($comment->comment_post_ID) . '</a>') . '</li>';
 			}