diff --git a/source/sitemap.xml.builder b/source/sitemap.xml.builder
index 081be25..ecbf0d2 100644
--- a/source/sitemap.xml.builder
+++ b/source/sitemap.xml.builder
@@ -2,8 +2,8 @@ xml.instruct!
 xml.urlset 'xmlns' => "http://www.sitemaps.org/schemas/sitemap/0.9" do
   sitemap.resources.select { |page| page.destination_path =~ /\.html/ && page.data.noindex != true }.each do |page|
     xml.url do
-      xml.loc URI.join(settings.casper[:blog][:url], page.destination_path)
-      last_mod = if page.path.start_with?('articles/')
+      xml.loc URI.join(settings.casper[:blog][:url], page.url)
+      last_mod = if page.path =~ /^\d{4}/
         File.mtime(page.source_file).to_time
       else
         Time.now