diff --git a/_includes/seo.html b/_includes/seo.html
index 2a3cbc2..efd95c5 100644
--- a/_includes/seo.html
+++ b/_includes/seo.html
@@ -1,7 +1,7 @@
 {% seo %}
 <!-- BEGIN seo.html -->
 <meta name="title" content="{{ page.title }} | {{ site.title }}" />
-<meta name="dc.date.modified" scheme="ISO8601" content="{{ site.time | date_to_xmlschema }}" />
+<meta name="dc.date.modified" scheme="ISO8601" content="{{ page.last_modified_at | date_to_xmlschema }}" />
 <meta name="robots" content="index" />
 <meta charset="utf-8" />
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />