diff --git a/wp-includes/compat.php b/wp-includes/compat.php
index f9fd5e2548..4edf33b0ce 100644
--- a/wp-includes/compat.php
+++ b/wp-includes/compat.php
@@ -129,7 +129,7 @@ if ( !function_exists('json_encode') ) {
 		global $wp_json;
 
 		if ( !is_a($wp_json, 'Services_JSON') ) {
-			require_once( './class-json.php' );
+			require_once( ABSPATH . WPINC . '/class-json.php' );
 			$wp_json = new Services_JSON();
 		}
 
@@ -142,7 +142,7 @@ if ( !function_exists('json_decode') ) {
 		global $wp_json;
 
 		if ( !is_a($wp_json, 'Services_JSON') ) {
-			require_once( './class-json.php' );
+			require_once( ABSPATH . WPINC . '/class-json.php' );
 			$wp_json = new Services_JSON();
 		}
 
diff --git a/wp-includes/media.php b/wp-includes/media.php
index 70f6af5122..a61fbbba92 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1337,7 +1337,7 @@ function wp_expand_dimensions( $example_width, $example_height, $max_width, $max
  * @return string The original URL on failure or the embed HTML on success.
  */
 function wp_oembed_get( $url, $args = '' ) {
-	require_once( './class-oembed.php' );
+	require_once( ABSPATH . WPINC . '/class-oembed.php' );
 	$oembed = _wp_oembed_get_object();
 	return $oembed->get_html( $url, $args );
 }
@@ -1355,7 +1355,7 @@ function wp_oembed_get( $url, $args = '' ) {
  * @param boolean $regex Whether the $format parameter is in a regex format.
  */
 function wp_oembed_add_provider( $format, $provider, $regex = false ) {
-	require_once( './class-oembed.php' );
+	require_once( ABSPATH . WPINC . '/class-oembed.php' );
 	$oembed = _wp_oembed_get_object();
 	$oembed->providers[$format] = array( $provider, $regex );
 }