diff --git a/bindings/ldk_node.udl b/bindings/ldk_node.udl
index 5cff3a6b5..50c3cc704 100644
--- a/bindings/ldk_node.udl
+++ b/bindings/ldk_node.udl
@@ -136,7 +136,7 @@ interface Bolt12Payment {
 
 interface SpontaneousPayment {
 	[Throws=NodeError]
-	PaymentId send(u64 amount_msat, PublicKey node_id, sequence<TlvEntry> custom_tlvs);
+	PaymentId send(u64 amount_msat, PublicKey node_id, sequence<TlvEntry> custom_tlvs, PaymentPreimage? preimage);
 	[Throws=NodeError]
 	void send_probes(u64 amount_msat, PublicKey node_id);
 };
diff --git a/src/payment/spontaneous.rs b/src/payment/spontaneous.rs
index 9efb8fefd..192565f40 100644
--- a/src/payment/spontaneous.rs
+++ b/src/payment/spontaneous.rs
@@ -44,13 +44,15 @@ impl SpontaneousPayment {
 	/// Send a spontaneous, aka. "keysend", payment
 	pub fn send(
 		&self, amount_msat: u64, node_id: PublicKey, custom_tlvs: Vec<TlvEntry>,
+		preimage: Option<PaymentPreimage>,
 	) -> Result<PaymentId, Error> {
 		let rt_lock = self.runtime.read().unwrap();
 		if rt_lock.is_none() {
 			return Err(Error::NotRunning);
 		}
 
-		let payment_preimage = PaymentPreimage(self.keys_manager.get_secure_random_bytes());
+		let payment_preimage = preimage
+			.unwrap_or_else(|| PaymentPreimage(self.keys_manager.get_secure_random_bytes()));
 		let payment_hash = PaymentHash::from(payment_preimage);
 		let payment_id = PaymentId(payment_hash.0);
 
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index a85aa3032..272d9f61e 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -699,7 +699,7 @@ pub(crate) fn do_channel_full_cycle<E: ElectrumApi>(
 	let tlv2 = TlvEntry { r#type: 131075, value: vec![0xaa, 0xbb] };
 	let keysend_payment_id = node_a
 		.spontaneous_payment()
-		.send(keysend_amount_msat, node_b.node_id(), vec![tlv1, tlv2])
+		.send(keysend_amount_msat, node_b.node_id(), vec![tlv1, tlv2], None)
 		.unwrap();
 	expect_event!(node_a, PaymentSuccessful);
 	let received_keysend_amount = match node_b.wait_next_event() {