diff --git a/src/vfsStreamFile.php b/src/vfsStreamFile.php
index 04aafaa..0e6aef3 100644
--- a/src/vfsStreamFile.php
+++ b/src/vfsStreamFile.php
@@ -260,7 +260,7 @@ public function getBytesRead(): int
     /**
      * seeks to the given offset
      */
-    public function seek(int $offset, int $whence): bool
+    public function seek(int $offset, int $whence = SEEK_SET): bool
     {
         return $this->content->seek($offset, $whence);
     }