diff --git a/src/wp-admin/includes/class-wp-debug-data.php b/src/wp-admin/includes/class-wp-debug-data.php
index 1eac01148d436..d0c2913b56b9a 100644
--- a/src/wp-admin/includes/class-wp-debug-data.php
+++ b/src/wp-admin/includes/class-wp-debug-data.php
@@ -1227,7 +1227,7 @@ public static function get_wp_mu_plugins(): array {
 	 *
 	 * @return array
 	 */
-	public static function get_wp_paths_sizes(): array {
+	private static function get_wp_paths_sizes(): array {
 		$loading    = __( 'Loading…' );
 
 		$fields = array(