diff --git a/lightning/src/ln/onion_utils.rs b/lightning/src/ln/onion_utils.rs
index b02bb48dc7e..2cd71171eff 100644
--- a/lightning/src/ln/onion_utils.rs
+++ b/lightning/src/ln/onion_utils.rs
@@ -320,7 +320,8 @@ pub(crate) const MIN_FINAL_VALUE_ESTIMATE_WITH_OVERPAY: u64 = 100_000_000;
 
 pub(crate) fn set_max_path_length(
 	route_params: &mut RouteParameters, recipient_onion: &RecipientOnionFields,
-	keysend_preimage: Option<PaymentPreimage>, best_block_height: u32,
+	keysend_preimage: Option<PaymentPreimage>, invoice_request: Option<&InvoiceRequest>,
+	best_block_height: u32,
 ) -> Result<(), ()> {
 	const PAYLOAD_HMAC_LEN: usize = 32;
 	let unblinded_intermed_payload_len = msgs::OutboundOnionPayload::Forward {
@@ -367,7 +368,7 @@ pub(crate) fn set_max_path_length(
 		&recipient_onion,
 		best_block_height,
 		&keysend_preimage,
-		None,
+		invoice_request,
 		|_, payload| {
 			num_reserved_bytes = num_reserved_bytes
 				.saturating_add(payload.serialized_length())
diff --git a/lightning/src/ln/outbound_payment.rs b/lightning/src/ln/outbound_payment.rs
index 31043c84de3..8aec075ff66 100644
--- a/lightning/src/ln/outbound_payment.rs
+++ b/lightning/src/ln/outbound_payment.rs
@@ -931,8 +931,9 @@ impl OutboundPayments {
 			custom_tlvs: vec![],
 		};
 		let route = match self.find_initial_route(
-			payment_id, payment_hash, &recipient_onion, None, &mut route_params, router,
-			&first_hops, &inflight_htlcs, node_signer, best_block_height, logger,
+			payment_id, payment_hash, &recipient_onion, keysend_preimage, invoice_request.as_ref(),
+			&mut route_params, router, &first_hops, &inflight_htlcs, node_signer, best_block_height,
+			logger,
 		) {
 			Ok(route) => route,
 			Err(e) => {
@@ -1044,7 +1045,7 @@ impl OutboundPayments {
 
 					if let Err(()) = onion_utils::set_max_path_length(
 						&mut route_params, &RecipientOnionFields::spontaneous_empty(), Some(keysend_preimage),
-						best_block_height
+						Some(invreq), best_block_height
 					) {
 						abandon_with_entry!(entry, PaymentFailureReason::RouteNotFound);
 						return Err(Bolt12PaymentError::SendingFailed(RetryableSendFailure::OnionPacketSizeExceeded))
@@ -1174,8 +1175,8 @@ impl OutboundPayments {
 	}
 
 	fn find_initial_route<R: Deref, NS: Deref, IH, L: Deref>(
-		&self, payment_id: PaymentId, payment_hash: PaymentHash,
-		recipient_onion: &RecipientOnionFields, keysend_preimage: Option<PaymentPreimage>,
+		&self, payment_id: PaymentId, payment_hash: PaymentHash, recipient_onion: &RecipientOnionFields,
+		keysend_preimage: Option<PaymentPreimage>, invoice_request: Option<&InvoiceRequest>,
 		route_params: &mut RouteParameters, router: &R, first_hops: &Vec<ChannelDetails>,
 		inflight_htlcs: &IH, node_signer: &NS, best_block_height: u32, logger: &L,
 	) -> Result<Route, RetryableSendFailure>
@@ -1194,7 +1195,7 @@ impl OutboundPayments {
 		}
 
 		onion_utils::set_max_path_length(
-			route_params, recipient_onion, keysend_preimage, best_block_height
+			route_params, recipient_onion, keysend_preimage, invoice_request, best_block_height
 		).map_err(|()| RetryableSendFailure::OnionPacketSizeExceeded)?;
 
 		let mut route = router.find_route_with_id(
@@ -1237,7 +1238,7 @@ impl OutboundPayments {
 		SP: Fn(SendAlongPathArgs) -> Result<(), APIError>,
 	{
 		let route = self.find_initial_route(
-			payment_id, payment_hash, &recipient_onion, keysend_preimage, &mut route_params, router,
+			payment_id, payment_hash, &recipient_onion, keysend_preimage, None, &mut route_params, router,
 			&first_hops, &inflight_htlcs, node_signer, best_block_height, logger,
 		)?;
 
diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs
index 4215f66b2da..30e99109ba0 100644
--- a/lightning/src/routing/router.rs
+++ b/lightning/src/routing/router.rs
@@ -641,8 +641,9 @@ impl RouteParameters {
 		&mut self, recipient_onion: &RecipientOnionFields, is_keysend: bool, best_block_height: u32
 	) -> Result<(), ()> {
 		let keysend_preimage_opt = is_keysend.then(|| PaymentPreimage([42; 32]));
+		// TODO: no way to account for the invoice request here yet
 		onion_utils::set_max_path_length(
-			self, recipient_onion, keysend_preimage_opt, best_block_height
+			self, recipient_onion, keysend_preimage_opt, None, best_block_height
 		)
 	}
 }