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 37c697e43f..62f7343069 100644
--- a/src/wp-includes/rest-api/class-wp-rest-server.php
+++ b/src/wp-includes/rest-api/class-wp-rest-server.php
@@ -1158,7 +1158,7 @@ class WP_REST_Server {
 	 *
 	 * @return string Raw request data.
 	 */
-	public function get_raw_data() {
+	public static function get_raw_data() {
 		global $HTTP_RAW_POST_DATA;
 
 		/*