diff --git a/src/UuidInterface.php b/src/UuidInterface.php
index 844b425..c9acca5 100644
--- a/src/UuidInterface.php
+++ b/src/UuidInterface.php
@@ -129,7 +129,7 @@ interface UuidInterface extends JsonSerializable, Serializable
     /**
      * Returns the 128-bit integer value of the UUID as a string
      *
-     * @return mixed
+     * @return string
      */
     public function getInteger();