diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4fbe5114a7..dff037cb1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ### HEAD
+* Lowercase `X-UA-Compatible` ([#1409](https://github.com/roots/sage/issues/1409))
 * Remove mention of Google Analytics from the config ([#1384](https://github.com/roots/sage/issues/1384))
 
 ### 8.1.1: March 31st, 2015
diff --git a/templates/head.php b/templates/head.php
index 5200b0ca11..44f79b4882 100644
--- a/templates/head.php
+++ b/templates/head.php
@@ -2,7 +2,7 @@
 <html class="no-js" <?php language_attributes(); ?>>
   <head>
     <meta charset="utf-8">
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta http-equiv="x-ua-compatible" content="ie=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="alternate" type="application/rss+xml" title="<?= get_bloginfo('name'); ?> Feed" href="<?= esc_url(get_feed_link()); ?>">
     <?php wp_head(); ?>
