diff --git a/lib/TransactionBuilder.js b/lib/TransactionBuilder.js
index 9d17b3d8..b1d4e5ee 100644
--- a/lib/TransactionBuilder.js
+++ b/lib/TransactionBuilder.js
@@ -70,6 +70,11 @@ var TransactionBuilder = function () {
         this.transaction.addOutput(scriptPubKey, amount);
       }
     }
+  }, {
+    key: 'setLockTime',
+    value: function setLockTime(locktime) {
+      this.transaction.setLockTime(locktime);
+    }
   }, {
     key: 'sign',
     value: function sign(vin, keyPair, redeemScript) {
diff --git a/src/TransactionBuilder.js b/src/TransactionBuilder.js
index a3709f7b..8500dcd8 100644
--- a/src/TransactionBuilder.js
+++ b/src/TransactionBuilder.js
@@ -44,6 +44,10 @@ class TransactionBuilder {
     }
   }
 
+  setLockTime(locktime) {
+    this.transaction.setLockTime(locktime);
+  }
+
   sign(vin, keyPair, redeemScript, hashType = this.hashTypes.SIGHASH_ALL, value) {
     let witnessScript;