diff --git a/layouts/sitemap.xml b/layouts/sitemap.xml
index a44870a..2b3b48a 100644
--- a/layouts/sitemap.xml
+++ b/layouts/sitemap.xml
@@ -3,9 +3,9 @@
   {{ range .Data.Pages }}
   <url>
     <loc>{{ .Permalink }}</loc>{{ if not .Lastmod.IsZero }}
-    <lastmod>{{ safeHTML ( .Lastmod.Format "2006-01-02T15:04:05-07:00" ) }}</lastmod>{{ end }}{{ with .Sitemap.ChangeFreq }}
-    <changefreq>{{ . }}</changefreq>{{ end }}{{ if ge .Sitemap.Priority 0.0 }}
-    <priority>{{ .Sitemap.Priority }}</priority>{{ end }}
+    <lastmod>{{ safeHTML ( .Lastmod.Format "2006-01-02T15:04:05-07:00" ) }}</lastmod>{{ else }}<lastmod>{{ .Site.LastChange }}</lastmod>{{ end }}{{ with .Sitemap.ChangeFreq }}
+    <changefreq>{{ . }}</changefreq>{{ else }}<changefreq>monthly</changefreq>{{ end }}{{ if ge .Sitemap.Priority 0.0 }}
+    <priority>{{ .Sitemap.Priority }}</priority>{{ else }}<priority>0.5</priority>{{ end }}
   </url>
   {{ end }}
 </urlset>