diff --git a/src/commands/libcoreSignAndBroadcast.js b/src/commands/libcoreSignAndBroadcast.js
index 14a8f063..07f36f7a 100644
--- a/src/commands/libcoreSignAndBroadcast.js
+++ b/src/commands/libcoreSignAndBroadcast.js
@@ -121,9 +121,14 @@ async function signTransaction({
 
   const changePath = output ? output.getDerivationPath().toString() : undefined
   const outputScriptHex = Buffer.from(transaction.serializeOutputs()).toString('hex')
-  const lockTime = undefined // TODO: transaction.getLockTime()
   const initialTimestamp = hasTimestamp ? transaction.getTimestamp() : undefined
 
+  // FIXME
+  // should be `transaction.getLockTime()` as soon as lock time is
+  // handled by libcore (actually: it always returns a default value
+  // and that caused issue with zcash (see #904))
+  const lockTime = undefined
+
   const signedTransaction = await hwApp.createPaymentTransactionNew(
     inputs,
     associatedKeysets,