diff --git a/src/StreamTrait.php b/src/StreamTrait.php
index f398dbc..e7185fe 100644
--- a/src/StreamTrait.php
+++ b/src/StreamTrait.php
@@ -118,6 +118,7 @@ public function detach()
      * Get the size of the stream if known.
      *
      * @return int|null Returns the size in bytes if known, or null if unknown.
+     * @psalm-suppress RedundantCast
      */
     public function getSize(): ?int
     {