diff --git a/layouts/_default/rss.xml b/layouts/_default/rss.xml
index 5874559..3d2e592 100644
--- a/layouts/_default/rss.xml
+++ b/layouts/_default/rss.xml
@@ -22,7 +22,7 @@
         <managingEditor>{{.}}{{ with $.Site.Params.Author.name }} ({{.}}){{end}}</managingEditor>{{end}}{{ with .Site.Params.Author.email }}
         <webMaster>{{.}}{{ with $.Site.Params.Author.name }} ({{.}}){{end}}</webMaster>{{end}}{{ with .Site.Copyright }}
         <copyright>{{.}}</copyright>{{end}}{{ if not .Date.IsZero }}
-        <lastBuildDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
+        <lastBuildDate>{{ (index $pages.ByLastmod.Reverse 0).Lastmod.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
         {{- with .OutputFormats.Get "RSS" -}}
         {{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
         {{- end -}}