diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index d3a8bcd2d7..ca445ec610 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -3090,12 +3090,15 @@ function _wp_json_prepare_data( $data ) {
  * Send a JSON response back to an Ajax request.
  *
  * @since 3.5.0
+ * @since 4.7.0 The `$status_code` parameter was added.
  *
- * @param mixed $response Variable (usually an array or object) to encode as JSON,
- *                        then print and die.
+ * @param mixed $response    Variable (usually an array or object) to encode as JSON,
+ *                           then print and die.
+ * @param int   $status_code The HTTP status code to output.
  */
-function wp_send_json( $response ) {
+function wp_send_json( $response, $status_code = 200 ) {
 	@header( 'Content-Type: application/json; charset=' . get_option( 'blog_charset' ) );
+	status_header( $status_code );
 	echo wp_json_encode( $response );
 	if ( wp_doing_ajax() )
 		wp_die();
@@ -3107,16 +3110,18 @@ function wp_send_json( $response ) {
  * Send a JSON response back to an Ajax request, indicating success.
  *
  * @since 3.5.0
+ * @since 4.7.0 The `$status_code` parameter was added.
  *
- * @param mixed $data Data to encode as JSON, then print and die.
+ * @param mixed $data        Data to encode as JSON, then print and die.
+ * @param int   $status_code The HTTP status code to output.
  */
-function wp_send_json_success( $data = null ) {
+function wp_send_json_success( $data = null, $status_code = 200 ) {
 	$response = array( 'success' => true );
 
 	if ( isset( $data ) )
 		$response['data'] = $data;
 
-	wp_send_json( $response );
+	wp_send_json( $response, $status_code );
 }
 
 /**
@@ -3129,10 +3134,12 @@ function wp_send_json_success( $data = null ) {
  *
  * @since 3.5.0
  * @since 4.1.0 The `$data` parameter is now processed if a WP_Error object is passed in.
+ * @since 4.7.0 The `$status_code` parameter was added.
  *
- * @param mixed $data Data to encode as JSON, then print and die.
+ * @param mixed $data        Data to encode as JSON, then print and die.
+ * @param int   $status_code The HTTP status code to output.
  */
-function wp_send_json_error( $data = null ) {
+function wp_send_json_error( $data = null, $status_code = 200 ) {
 	$response = array( 'success' => false );
 
 	if ( isset( $data ) ) {
@@ -3150,7 +3157,7 @@ function wp_send_json_error( $data = null ) {
 		}
 	}
 
-	wp_send_json( $response );
+	wp_send_json( $response, $status_code );
 }
 
 /**