diff --git a/wp-includes/feed.php b/wp-includes/feed.php
index 88064c99a9..ccdd1b0fc1 100644
--- a/wp-includes/feed.php
+++ b/wp-includes/feed.php
@@ -115,7 +115,7 @@ function get_author_rss_link($echo = false, $author_id, $author_nicename) {
 		$link = get_option('home') . '?feed=rss2&author=' . $author_id;
 	} else {
 		$link = get_author_posts_url($author_id, $author_nicename);
-		$link = $link . user_trailingslashit('feed', 'feed');
+		$link = trailingslashit($link) . user_trailingslashit('feed', 'feed');
 	}
 
 	$link = apply_filters('author_feed_link', $link);
@@ -133,7 +133,7 @@ function get_category_rss_link($echo = false, $cat_ID, $category_nicename) {
 		$link = get_option('home') . '?feed=rss2&cat=' . $cat_ID;
 	} else {
 		$link = get_category_link($cat_ID);
-		$link = $link . user_trailingslashit('feed', 'feed');
+		$link = trailingslashit($link) . user_trailingslashit('feed', 'feed');
 	}
 
 	$link = apply_filters('category_feed_link', $link);