diff --git a/lib/attachments/gridstore-storage.js b/lib/attachments/gridstore-storage.js
index c641bfcd..466e53c7 100644
--- a/lib/attachments/gridstore-storage.js
+++ b/lib/attachments/gridstore-storage.js
@@ -48,6 +48,7 @@ class GridstoreStorage {
         let metadata = {
             m: attachment.magic,
             c: 1,
+            esize: attachment.body.length,
             transferEncoding: attachment.transferEncoding
         };