diff --git a/relay.ml b/relay.ml
index 339d82e..204052d 100644
--- a/relay.ml
+++ b/relay.ml
@@ -61,7 +61,7 @@ let issue_banner cin cout =
 let relay_boot (peername, cin, cout) = return (peername, Lwt_mutex.create (), cin, cout)
 
 let relay_handler (_, mtx, _, cout) _ m =
-  Lwt_mutex.with_lock mtx (fun () -> output_sexp_and_flush cout m)
+  Lwt_mutex.with_lock mtx (fun () -> output_sexp cout m)
 
 let relay_mainloop (peername, mtx, cin, cout) n =
   let write_sexp sexp = Lwt_mutex.with_lock mtx (fun () -> output_sexp cout sexp) in