diff --git a/system/I18n/TimeDifference.php b/system/I18n/TimeDifference.php
index 2fcd09bd38e0..4b0e1aa595c1 100644
--- a/system/I18n/TimeDifference.php
+++ b/system/I18n/TimeDifference.php
@@ -271,7 +271,7 @@ public function humanize(?string $locale = null): string
      *
      * @param string $name
      *
-     * @return mixed
+     * @return float|int|null
      */
     public function __get($name)
     {