diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 9b0c5852..e1652e81 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -1488,7 +1488,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
         if (locktime.cmpn(0) < 0)
           throw new ScriptError('NEGATIVE_LOCKTIME', op, ip);
 
-        locktime = locktime.uand(utils.U32).toNumber();
+        locktime = locktime.toNumber();
 
         if (!Script.checkLocktime(locktime, tx, index))
           throw new ScriptError('UNSATISFIED_LOCKTIME', op, ip);
@@ -1514,7 +1514,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
         if (locktime.cmpn(0) < 0)
           throw new ScriptError('NEGATIVE_LOCKTIME', op, ip);
 
-        locktime = locktime.uand(utils.U32).toNumber();
+        locktime = locktime.toNumber();
 
         if ((locktime & constants.sequence.DISABLE_FLAG) !== 0)
           break;