diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 02a67015..ef40b2fa 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -127,7 +127,7 @@ TX.prototype.signature = function(input, key, type) {
     type = 'all';
 
   if (typeof type === 'string')
-    type = bcoin.protocol.constants.hashType[type];
+    type = constants.hashType[type];
 
   // Get the previous output's subscript
   var s = input.out.tx.getSubscript(input.out.index);
@@ -203,7 +203,7 @@ TX.prototype.signInput = function(input, key, type) {
     type = 'all';
 
   if (typeof type === 'string')
-    type = bcoin.protocol.constants.hashType[type];
+    type = constants.hashType[type];
 
   // Get the previous output's subscript
   var s = input.out.tx.getSubscript(input.out.index);
@@ -412,7 +412,7 @@ TX.prototype.subscriptHash = function subscriptHash(index, s, type) {
   var copy = this.clone();
 
   if (typeof type === 'string')
-    type = bcoin.protocol.constants.hashType[type];
+    type = constants.hashType[type];
 
   copy.inputs.forEach(function(input, i) {
     input.script = index === i ? s : [];