diff --git a/lightningd/pay.c b/lightningd/pay.c
index a6b4292c417f..cd21140abd1a 100644
--- a/lightningd/pay.c
+++ b/lightningd/pay.c
@@ -1462,7 +1462,7 @@ static struct command_result *json_createonion(struct command *cmd,
 
 	if (sphinx_path_payloads_size(sp) > ROUTING_INFO_SIZE)
 		return command_fail(
-		    cmd, LIGHTNINGD,
+		    cmd, JSONRPC2_INVALID_PARAMS,
 		    "Payloads exceed maximum onion packet size.");
 
 	packet = create_onionpacket(cmd, sp, &shared_secrets);