diff --git a/lightningd/pay.c b/lightningd/pay.c
index d6a013d51766..44a8653c982e 100644
--- a/lightningd/pay.c
+++ b/lightningd/pay.c
@@ -97,7 +97,7 @@ void json_add_payment_fields(struct json_stream *response,
 	if (amount_msat_greater(t->msatoshi, AMOUNT_MSAT(0)))
 		json_add_amount_msat_compat(response, t->msatoshi, "msatoshi",
 					    "amount_msat");
-	else
+	else if (deprecated_apis)
 		json_add_null(response, "amount_msat");