diff --git a/templates/SitemapXML.ss b/templates/SitemapXML.ss
index c9f6780..9f71c88 100644
--- a/templates/SitemapXML.ss
+++ b/templates/SitemapXML.ss
@@ -7,8 +7,8 @@
     
     <loc>{$Top.SitemapHost}$Link</loc>
     <lastmod>$SitemapDate</lastmod>
-    <changefreq>$ChangeFrequency</changefreq>
-    <priority>$Priority</priority>
+    <changefreq><% if $ChangeFrequency %>$ChangeFrequency<% else %>monthly<% end_if %></changefreq>
+    <priority><% if HasValue($Priority) %>$Priority<% else %>0.5<% end_if %></priority>
 
     <% loop $SitemapImages %>