diff --git a/src/scripts.js b/src/scripts.js
index ee317bb..661285a 100644
--- a/src/scripts.js
+++ b/src/scripts.js
@@ -116,7 +116,7 @@ function isScriptHashInput() {
   var scriptSig = Script.fromChunks(this.chunks.slice(0, -1))
   var scriptPubKey = Script.fromBuffer(lastChunk)
 
-  return classifyInput(scriptSig, false) === classifyOutput(scriptPubKey)
+  return classifyInput(scriptSig) === classifyOutput(scriptPubKey)
 }
 
 function isScriptHashOutput() {