diff --git a/backend/src/app/util/blob.clj b/backend/src/app/util/blob.clj
index 3c740516b..42539b934 100644
--- a/backend/src/app/util/blob.clj
+++ b/backend/src/app/util/blob.clj
@@ -108,7 +108,7 @@
         cdata (byte-array mlen)
         clen  (Zstd/compressByteArray ^bytes cdata 0 mlen
                                       ^bytes data 0 dlen
-                                      4)]
+                                      6)]
     (with-open [^ByteArrayOutputStream baos (ByteArrayOutputStream. (+ (alength cdata) 2 4))
                 ^DataOutputStream dos (DataOutputStream. baos)]
       (.writeShort dos (short 3)) ;; version number