diff --git a/lib/primitives/tx.js b/lib/primitives/tx.js
index 850e35c3..7543eac1 100644
--- a/lib/primitives/tx.js
+++ b/lib/primitives/tx.js
@@ -1154,10 +1154,8 @@ TX.prototype.verifyLocktime = function verifyLocktime(index, locktime) {
   var threshold = consensus.LOCKTIME_THRESHOLD;
   var input = this.inputs[index];
 
-  if (!(
-    (this.locktime < threshold && locktime < threshold)
-    || (this.locktime >= threshold && locktime >= threshold)
-  )) {
+  if (!((this.locktime < threshold && locktime < threshold)
+      || (this.locktime >= threshold && locktime >= threshold))) {
     return false;
   }
 
@@ -1173,37 +1171,36 @@ TX.prototype.verifyLocktime = function verifyLocktime(index, locktime) {
 /**
  * Verify the nSequence locktime of a transaction.
  * @param {Number} index - Index of input being verified.
- * @param {Number} sequence - Locktime to verify against.
+ * @param {Number} locktime - Sequence locktime to verify against.
  * @returns {Boolean}
  */
 
-TX.prototype.verifySequence = function verifySequence(index, sequence) {
+TX.prototype.verifySequence = function verifySequence(index, locktime) {
+  var DISABLE_FLAG = consensus.SEQUENCE_DISABLE_FLAG;
+  var TYPE_FLAG = consensus.SEQUENCE_TYPE_FLAG;
+  var SEQUENCE_MASK = consensus.SEQUENCE_MASK;
   var input = this.inputs[index];
-  var mask, seq1, seq2;
+  var mask, sequence, predicate;
 
-  if ((sequence & consensus.SEQUENCE_DISABLE_FLAG) !== 0)
+  if ((locktime & DISABLE_FLAG) !== 0)
     return true;
 
   if (this.version < 2)
     return false;
 
-  if (input.sequence & consensus.SEQUENCE_DISABLE_FLAG)
+  if ((input.sequence & DISABLE_FLAG) !== 0)
     return false;
 
-  mask = consensus.SEQUENCE_TYPE_FLAG | consensus.SEQUENCE_MASK;
-  seq1 = input.sequence & mask;
-  seq2 = sequence & mask;
+  mask = TYPE_FLAG | SEQUENCE_MASK;
+  sequence = input.sequence & mask;
+  predicate = locktime & mask;
 
-  if (!(
-    (seq1 < consensus.SEQUENCE_TYPE_FLAG
-    && seq2 < consensus.SEQUENCE_TYPE_FLAG)
-    || (seq1 >= consensus.SEQUENCE_TYPE_FLAG
-    && seq2 >= consensus.SEQUENCE_TYPE_FLAG)
-  )) {
+  if (!((sequence < TYPE_FLAG && predicate < TYPE_FLAG)
+      || (sequence >= TYPE_FLAG && predicate >= TYPE_FLAG))) {
     return false;
   }
 
-  if (seq2 > seq1)
+  if (predicate > sequence)
     return false;
 
   return true;