diff --git a/_includes/header.html b/_includes/header.html
index 2c9c1ea..c0996eb 100644
--- a/_includes/header.html
+++ b/_includes/header.html
@@ -10,7 +10,7 @@
 		<meta property="og:title" content="{{ page.title }}" />
 {% if page.layout == "post" %}
 		<meta property="og:type" content="article" />
-		<meta property="og:published_time" content="{{ page.date | date: "%FT%TZ" }}" />
+		<meta property="article:published_time" content="{{ page.date | date: "%FT%TZ" }}" />
 {% for author in page.authors %}
 		<meta property="article:author" content="https://github.com/{{ author }}" />
 		<meta property="article:author:username" content="{{ author }}" />