diff --git a/src/wp-includes/rest-api/class-wp-rest-server.php b/src/wp-includes/rest-api/class-wp-rest-server.php
index 1b1a24439b..1a43a1ac32 100644
--- a/src/wp-includes/rest-api/class-wp-rest-server.php
+++ b/src/wp-includes/rest-api/class-wp-rest-server.php
@@ -240,7 +240,7 @@ class WP_REST_Server {
 		 */
 		$this->send_header( 'X-Content-Type-Options', 'nosniff' );
 		$this->send_header( 'Access-Control-Expose-Headers', 'X-WP-Total, X-WP-TotalPages' );
-		$this->send_header( 'Access-Control-Allow-Headers', 'Authorization' );
+		$this->send_header( 'Access-Control-Allow-Headers', 'Authorization, Content-Type' );
 
 		/**
 		 * Send nocache headers on authenticated requests.