diff --git a/lib/jekyll/related_posts.rb b/lib/jekyll/related_posts.rb
index be0513fc..041ee551 100644
--- a/lib/jekyll/related_posts.rb
+++ b/lib/jekyll/related_posts.rb
@@ -46,8 +46,7 @@ module Jekyll
     end
 
     def most_recent_posts
-      recent_posts = site.posts.reverse - [post]
-      recent_posts.first(10)
+      @most_recent_posts ||= (site.posts.reverse - [post]).first(10)
     end
 
     def display(output)