From e19bae814fc30d8fb9094259911b86a2c5bfb52b Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Fri, 4 Aug 2017 15:53:26 -0400
Subject: [PATCH] Backport memoize-document-url from #6266 to 3.5-stable

---
 lib/jekyll/document.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index 8634082c4d9..180f54fb67b 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -203,7 +203,7 @@ def permalink
     #
     # Returns the computed URL for the document.
     def url
-      @url = URL.new({
+      @url ||= URL.new({
         :template     => url_template,
         :placeholders => url_placeholders,
         :permalink    => permalink,