diff --git a/wp-includes/class-oembed.php b/wp-includes/class-oembed.php
index 353837ff22..9c0aa1d60d 100644
--- a/wp-includes/class-oembed.php
+++ b/wp-includes/class-oembed.php
@@ -18,14 +18,14 @@
  * @since 2.9.0
  */
 class WP_oEmbed {
-	var $providers = array();
+	public $providers = array();
 
 	/**
 	 * Constructor
 	 *
 	 * @uses apply_filters() Filters a list of pre-defined oEmbed providers.
 	 */
-	function __construct() {
+	public function __construct() {
 		$providers = array(
 			'#http://(www\.)?youtube\.com/watch.*#i'              => array( 'http://www.youtube.com/oembed',                      true  ),
 			'#https://(www\.)?youtube\.com/watch.*#i'             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
@@ -76,6 +76,18 @@ class WP_oEmbed {
 		add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
 	}
 
+	/**
+	 * Make private/protected methods readable for backwards compatibility
+	 *
+	 * @since 4.0.0
+	 * @param string $name
+	 * @param array $arguments
+	 * @return mixed
+	 */
+	public function __call( $name, $arguments ) {
+		return call_user_func_array( array( $this, $name ), $arguments );
+	}
+
 	/**
 	 * The do-it-all function that takes a URL and attempts to return the HTML.
 	 *
@@ -87,7 +99,7 @@ class WP_oEmbed {
 	 * @param array $args Optional arguments. Usually passed from a shortcode.
 	 * @return bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
 	 */
-	function get_html( $url, $args = '' ) {
+	public function get_html( $url, $args = '' ) {
 		$provider = false;
 
 		if ( !isset($args['discover']) )
@@ -132,7 +144,7 @@ class WP_oEmbed {
 	 * @param string $url The URL that should be inspected for discovery <link> tags.
 	 * @return bool|string False on failure, otherwise the oEmbed provider URL.
 	 */
-	function discover( $url ) {
+	public function discover( $url ) {
 		$providers = array();
 
 		// Fetch URL content
@@ -198,7 +210,7 @@ class WP_oEmbed {
 	 * @param array $args Optional arguments. Usually passed from a shortcode.
 	 * @return bool|object False on failure, otherwise the result in the form of an object.
 	 */
-	function fetch( $provider, $url, $args = '' ) {
+	public function fetch( $provider, $url, $args = '' ) {
 		$args = wp_parse_args( $args, wp_embed_defaults() );
 
 		$provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
@@ -234,7 +246,7 @@ class WP_oEmbed {
 	 * @param string $format Format to use
 	 * @return bool|object False on failure, otherwise the result in the form of an object.
 	 */
-	function _fetch_with_format( $provider_url_with_args, $format ) {
+	private function _fetch_with_format( $provider_url_with_args, $format ) {
 		$provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
 		$response = wp_safe_remote_get( $provider_url_with_args );
 		if ( 501 == wp_remote_retrieve_response_code( $response ) )
@@ -251,7 +263,7 @@ class WP_oEmbed {
 	 * @since 3.0.0
 	 * @access private
 	 */
-	function _parse_json( $response_body ) {
+	private function _parse_json( $response_body ) {
 		return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false;
 	}
 
@@ -261,7 +273,7 @@ class WP_oEmbed {
 	 * @since 3.0.0
 	 * @access private
 	 */
-	function _parse_xml( $response_body ) {
+	private function _parse_xml( $response_body ) {
 		if ( ! function_exists( 'libxml_disable_entity_loader' ) )
 			return false;
 
@@ -318,7 +330,7 @@ class WP_oEmbed {
 	 * @param string $url The URL to the content that is desired to be embedded.
 	 * @return bool|string False on error, otherwise the HTML needed to embed.
 	 */
-	function data2html( $data, $url ) {
+	public function data2html( $data, $url ) {
 		if ( ! is_object( $data ) || empty( $data->type ) )
 			return false;
 
@@ -373,7 +385,7 @@ class WP_oEmbed {
 	 * @param string $url The original URL passed to oEmbed.
 	 * @return string Possibly modified $html
 	 */
-	function _strip_newlines( $html, $data, $url ) {
+	private function _strip_newlines( $html, $data, $url ) {
 		if ( false !== strpos( $html, "\n" ) )
 			$html = str_replace( array( "\r\n", "\n" ), '', $html );