diff --git a/src/wp-includes/class-wp-customize-nav-menus.php b/src/wp-includes/class-wp-customize-nav-menus.php
index 898152d6c7..9a41239e76 100644
--- a/src/wp-includes/class-wp-customize-nav-menus.php
+++ b/src/wp-includes/class-wp-customize-nav-menus.php
@@ -749,18 +749,15 @@ final class WP_Customize_Nav_Menus {
 	 */
 	public function ajax_insert_auto_draft_post() {
 		if ( ! check_ajax_referer( 'customize-menus', 'customize-menus-nonce', false ) ) {
-			status_header( 400 );
-			wp_send_json_error( 'bad_nonce' );
+			wp_send_json_error( 'bad_nonce', 400 );
 		}
 
 		if ( ! current_user_can( 'customize' ) ) {
-			status_header( 403 );
-			wp_send_json_error( 'customize_not_allowed' );
+			wp_send_json_error( 'customize_not_allowed', 403 );
 		}
 
 		if ( empty( $_POST['params'] ) || ! is_array( $_POST['params'] ) ) {
-			status_header( 400 );
-			wp_send_json_error( 'missing_params' );
+			wp_send_json_error( 'missing_params', 400 );
 		}
 
 		$params = wp_array_slice_assoc(
diff --git a/src/wp-includes/customize/class-wp-customize-selective-refresh.php b/src/wp-includes/customize/class-wp-customize-selective-refresh.php
index 245d32a27b..95c1934d38 100644
--- a/src/wp-includes/customize/class-wp-customize-selective-refresh.php
+++ b/src/wp-includes/customize/class-wp-customize-selective-refresh.php
@@ -315,11 +315,9 @@ final class WP_Customize_Selective_Refresh {
 		 * WP_Customize_Manager::setup_theme() is where the previewing flag is set.
 		 */
 		if ( ! is_customize_preview() ) {
-			status_header( 403 );
-			wp_send_json_error( 'expected_customize_preview' );
+			wp_send_json_error( 'expected_customize_preview', 403 );
 		} else if ( ! isset( $_POST['partials'] ) ) {
-			status_header( 400 );
-			wp_send_json_error( 'missing_partials' );
+			wp_send_json_error( 'missing_partials', 400 );
 		}
 
 		$partials = json_decode( wp_unslash( $_POST['partials'] ), true );