diff --git a/src/silentpayments.rs b/src/silentpayments.rs
index d4f815a..cb815d3 100644
--- a/src/silentpayments.rs
+++ b/src/silentpayments.rs
@@ -38,7 +38,7 @@ use crate::crypto::AnkSharedSecret;
 pub fn create_transaction_for_address_with_shared_secret(
     sp_address: SilentPaymentAddress,
     sp_wallet: &SpWallet,
-    message: String,
+    message: Option<String>,
     fee_rate: Amount,
 ) -> Result<(Transaction, AnkSharedSecret)> {
     let available_outpoints = sp_wallet.get_outputs().to_spendable_list();
@@ -70,7 +70,7 @@ pub fn create_transaction_for_address_with_shared_secret(
     let mut new_psbt = sp_wallet.get_client().create_new_psbt(
         inputs,
         vec![recipient],
-        Some(message.as_bytes()),
+        message.as_ref().map(|m| m.as_bytes()),
     )?;
 
     let change_addr = sp_wallet.get_client().sp_receiver.get_change_address();