diff --git a/src/rpc/core_rpc_server_commands_defs.h b/src/rpc/core_rpc_server_commands_defs.h
index ad0bff077..2230141d5 100644
--- a/src/rpc/core_rpc_server_commands_defs.h
+++ b/src/rpc/core_rpc_server_commands_defs.h
@@ -836,7 +836,7 @@ namespace cryptonote
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(tx_as_hex)
-        KV_SERIALIZE(do_not_relay)
+        KV_SERIALIZE_OPT(do_not_relay, false)
       END_KV_SERIALIZE_MAP()
     };