diff --git a/back-compat/templates-v0-3/single.php b/back-compat/templates-v0-3/single.php
index a19858e6322..10adddffc85 100644
--- a/back-compat/templates-v0-3/single.php
+++ b/back-compat/templates-v0-3/single.php
@@ -5,12 +5,18 @@
  * @package AMP
  */
 
+/**
+ * Context.
+ *
+ * @var AMP_Post_Template $this
+ */
+
 ?>
 <!doctype html>
 <html amp <?php language_attributes(); ?>>
 <head>
 	<meta charset="utf-8">
-	<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
+	<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 	<?php do_action( 'amp_post_template_head', $this ); ?>
 
 	<style amp-custom>
