diff --git a/system/src/Grav/Common/Page/Medium/Medium.php b/system/src/Grav/Common/Page/Medium/Medium.php
index b47d97791..52f8e8e95 100644
--- a/system/src/Grav/Common/Page/Medium/Medium.php
+++ b/system/src/Grav/Common/Page/Medium/Medium.php
@@ -58,6 +58,7 @@ class Medium extends Data implements RenderableInterface
         parent::__construct($items, $blueprint);
 
         $this->def('mime', 'application/octet-stream');
+        $this->reset();
     }
 
     /**