diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index d05d2371bc..da4c2f27a9 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -119,23 +119,35 @@ if (!CUSTOM_TAGS) {
 			'target' => array ()),
 		'h1' => array(
 			'align' => array (),
-			'class' => array ()),
-		'h2' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'h2' => array (
 			'align' => array (),
-			'class' => array ()),
-		'h3' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'h3' => array (
 			'align' => array (),
-			'class' => array ()),
-		'h4' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'h4' => array (
 			'align' => array (),
-			'class' => array ()),
-		'h5' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'h5' => array (
 			'align' => array (),
-			'class' => array ()),
-		'h6' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'h6' => array (
 			'align' => array (),
-			'class' => array ()),
-		'hr' => array(
+			'class' => array (),
+			'id'    => array (),
+			'style' => array ()),
+		'hr' => array (
 			'align' => array (),
 			'class' => array (),
 			'noshade' => array (),