diff --git a/package.json b/package.json
index 3bc0417..87d9482 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cryptoforknote-util",
-  "version": "15.3.9",
+  "version": "15.3.10",
   "author": {
     "name": "LucasJones",
     "email": "lucasjonesdev@hotmail.co.uk"
diff --git a/rtm.js b/rtm.js
index c15808e..bb79985 100644
--- a/rtm.js
+++ b/rtm.js
@@ -229,7 +229,7 @@ function generateTransactionOutputs(rpcData, poolAddress, is_witness) {
 
 module.exports.RtmBlockTemplate = function(rpcData, poolAddress) {
   const extraNoncePlaceholderLength = 17;
-  const coinbaseVersion = Buffer.concat([packUInt16LE(3), packUInt16LE(5)]);
+  const coinbaseVersion = rpcData.coinbaseaux.flags ? Buffer.concat([packUInt16LE(3), packUInt16LE(5)]) : Buffer.concat([packUInt16LE(1), packUInt16LE(0)]);
 
   const scriptSigPart1 = Buffer.concat([
     serializeNumber(rpcData.height),