Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 29206)
+++ src/wp-includes/media.php	(working copy)
@@ -1399,7 +1399,7 @@
 	}
 	?></ol>
 	</noscript>
-	<script type="application/json"><?php echo json_encode( $data ) ?></script>
+	<script type="application/json"><?php echo wp_json_encode( $data ) ?></script>
 </div>
 	<?php
 	return ob_get_clean();