diff --git a/src/Illuminate/Contracts/Cache/Repository.php b/src/Illuminate/Contracts/Cache/Repository.php
index 0547aaa3de60..4bc4638e46fe 100644
--- a/src/Illuminate/Contracts/Cache/Repository.php
+++ b/src/Illuminate/Contracts/Cache/Repository.php
@@ -71,7 +71,7 @@ public function forever($key, $value);
      * @template TCacheValue
      *
      * @param  string  $key
-     * @param  \DateTimeInterface|\DateInterval|int|null  $ttl
+     * @param  \DateTimeInterface|\DateInterval|\Closure|int|null  $ttl
      * @param  \Closure(): TCacheValue  $callback
      * @return TCacheValue
      */