diff --git a/src/Simplex/Messaging/Transport.hs b/src/Simplex/Messaging/Transport.hs
index c42c543e1..3b37e4006 100644
--- a/src/Simplex/Messaging/Transport.hs
+++ b/src/Simplex/Messaging/Transport.hs
@@ -116,7 +116,7 @@ import UnliftIO.STM
 -- * Transport parameters
 
 smpBlockSize :: Int
-smpBlockSize = 16384 * 2
+smpBlockSize = 16384 + 1024
 
 -- SMP protocol version history:
 -- 1 - binary protocol encoding (1/1/2022)