diff --git a/lib/script/script.js b/lib/script/script.js
index faf2605d..b78575eb 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -26,8 +26,6 @@ const common = require('./common');
 const Address = require('../primitives/address');
 const opcodes = common.opcodes;
 const scriptTypes = common.types;
-const Hash160 = hash160;
-const Sha256 = sha256;
 const {encoding} = bio;
 
 /*
@@ -1813,7 +1811,7 @@ class Script {
    */
 
   hash160(enc) {
-    let hash = Hash160.digest(this.toRaw());
+    let hash = hash160.digest(this.toRaw());
     if (enc === 'hex')
       hash = hash.toString('hex');
     return hash;
@@ -1826,7 +1824,7 @@ class Script {
    */
 
   sha256(enc) {
-    let hash = Sha256.digest(this.toRaw());
+    let hash = sha256.digest(this.toRaw());
     if (enc === 'hex')
       hash = hash.toString('hex');
     return hash;