diff --git a/system/Encryption/Encryption.php b/system/Encryption/Encryption.php
index 81b25eeff5f5..fda9906240cb 100644
--- a/system/Encryption/Encryption.php
+++ b/system/Encryption/Encryption.php
@@ -149,7 +149,7 @@ public static function createKey($length = 32)
      *
      * @param string $key Property name
      *
-     * @return mixed
+     * @return array|string|null
      */
     public function __get($key)
     {
diff --git a/system/Encryption/Handlers/BaseHandler.php b/system/Encryption/Handlers/BaseHandler.php
index 13f60e970362..64195672439e 100644
--- a/system/Encryption/Handlers/BaseHandler.php
+++ b/system/Encryption/Handlers/BaseHandler.php
@@ -61,7 +61,7 @@ protected static function substr($str, $start, $length = null)
      *
      * @param string $key Property name
      *
-     * @return mixed
+     * @return array|bool|int|string|null
      */
     public function __get($key)
     {