diff --git a/src/Required/PersistenceInterface.php b/src/Required/PersistenceInterface.php
index ed23e12..d62b4a3 100644
--- a/src/Required/PersistenceInterface.php
+++ b/src/Required/PersistenceInterface.php
@@ -39,7 +39,7 @@ interface PersistenceInterface
      *                       Only codes generated at a time greater than the indicated time will be deemed valid.
      * @return bool
      */
-    public function storeLastTime(mixed $index, int $timestamp): bool;
+    public function storeLastTime(mixed $index, int $timestamp);
 
     /**
      * Gets and returns the otpauth URI for the user associated with the given user_id.