diff --git a/lib/script_interpreter.js b/lib/script_interpreter.js
index db2ede8ba..2057b382c 100644
--- a/lib/script_interpreter.js
+++ b/lib/script_interpreter.js
@@ -136,7 +136,7 @@ ScriptInterpreter.prototype.checkSignatureEncoding = function(buf) {
       return false;
     }
   } else if ((this.flags & ScriptInterpreter.SCRIPT_VERIFY_STRICTENC) !== 0) {
-    sig = Signature().fromTxFormat(buf);
+    sig = Signature.fromTxFormat(buf);
     if (!sig.hasDefinedHashtype()) {
       this.errstr = 'SCRIPT_ERR_SIG_HASHTYPE';
       return false;
@@ -149,7 +149,7 @@ ScriptInterpreter.prototype.checkSignatureEncoding = function(buf) {
  * Translated from bitcoind's CheckPubKeyEncoding
  */
 ScriptInterpreter.prototype.checkPubkeyEncoding = function(buf) {
-  if ((this.flags & ScriptInterpreter.SCRIPT_VERIFY_STRICTENC) !== 0 && !Pubkey.isCompressedOrUncompressed(buf)) {
+  if ((this.flags & ScriptInterpreter.SCRIPT_VERIFY_STRICTENC) !== 0 && !PublicKey.isCompressedOrUncompressed(buf)) {
     this.errstr = 'SCRIPT_ERR_PUBKEYTYPE';
     return false;
   }
@@ -889,7 +889,7 @@ ScriptInterpreter.prototype.step = function() {
           var fSuccess;
           try {
             var sig = Signature().fromTxFormat(bufSig);
-            var pubkey = Pubkey().fromBuffer(bufPubkey, false);
+            var pubkey = PublicKey().fromBuffer(bufPubkey, false);
             fSuccess = this.tx.verify(sig, pubkey, this.nin, subscript);
           } catch (e) {
             //invalid sig or pubkey
@@ -979,7 +979,7 @@ ScriptInterpreter.prototype.step = function() {
             var fOk;
             try {
               var sig = Signature().fromTxFormat(bufSig);
-              var pubkey = Pubkey().fromBuffer(bufPubkey, false);
+              var pubkey = PublicKey().fromBuffer(bufPubkey, false);
               fOk = this.tx.verify(sig, pubkey, this.nin, subscript);
             } catch (e) {
               //invalid sig or pubkey