diff --git a/src/_h5ai/header.html b/src/_h5ai/header.html
index 1cada171..c5ae49f6 100644
--- a/src/_h5ai/header.html
+++ b/src/_h5ai/header.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
-<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en"> <![endif]-->
-<!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en"> <![endif]-->
-<!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en"> <![endif]-->
+<!--[if lt IE 7]> <html class="h5ai-js no-js ie6 oldie" lang="en"> <![endif]-->
+<!--[if IE 7]>    <html class="h5ai-js no-js ie7 oldie" lang="en"> <![endif]-->
+<!--[if IE 8]>    <html class="h5ai-js no-js ie8 oldie" lang="en"> <![endif]-->
 <!--[if gt IE 8]><!--> <html class="h5ai-js no-js" lang="en"> <!--<![endif]-->
 <head>
 	<meta charset="utf-8">
diff --git a/src/_h5ai/header.php b/src/_h5ai/header.php
index 1d0d0790..c428286f 100644
--- a/src/_h5ai/header.php
+++ b/src/_h5ai/header.php
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
-<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en"> <![endif]-->
-<!--[if IE 7]>    <html class="no-js ie7 oldie" lang="en"> <![endif]-->
-<!--[if IE 8]>    <html class="no-js ie8 oldie" lang="en"> <![endif]-->
+<!--[if lt IE 7]> <html class="h5ai-php no-js ie6 oldie" lang="en"> <![endif]-->
+<!--[if IE 7]>    <html class="h5ai-php no-js ie7 oldie" lang="en"> <![endif]-->
+<!--[if IE 8]>    <html class="h5ai-php no-js ie8 oldie" lang="en"> <![endif]-->
 <!--[if gt IE 8]><!--> <html class="h5ai-php no-js" lang="en"> <!--<![endif]-->
 <?php include "php/main.php"; ?>
 <head>
