diff --git a/wallet/reservation.c b/wallet/reservation.c
index 1e678608e..9f433e60b 100644
--- a/wallet/reservation.c
+++ b/wallet/reservation.c
@@ -393,6 +393,8 @@ fee_calc:
 		struct amount_sat est_fee =
 			amount_tx_fee(feerate_per_kw, weight);
 		psbt_append_output(psbt, NULL, est_fee);
+		/* Add additional weight of fee output */
+		weight += bitcoin_tx_output_weight(0);
 	}
 	response = json_stream_success(cmd);
 	json_add_psbt(response, "psbt", psbt);