diff --git a/shared/lib/Mail/Object/MessagePartInterface.php b/shared/lib/Mail/Object/MessagePartInterface.php
index c2c0554..49f6a5b 100644
--- a/shared/lib/Mail/Object/MessagePartInterface.php
+++ b/shared/lib/Mail/Object/MessagePartInterface.php
@@ -22,7 +22,7 @@ interface MessagePartInterface extends JsonSerializable {
 
     public const PROPERTY_PART_ID = 'partId';
     public const PROPERTY_BLOB_ID = 'blobId';
-    public const PROPERTY_BLOB_IDSIZE = 'size';
+    public const PROPERTY_SIZE = 'size';
     public const PROPERTY_NAME = 'name';
     public const PROPERTY_TYPE = 'type';
     public const PROPERTY_CHARSET = 'charset';