diff --git a/lib/script/interpreter.js b/lib/script/interpreter.js
index 4185994e4..cebe3b1ff 100644
--- a/lib/script/interpreter.js
+++ b/lib/script/interpreter.js
@@ -176,7 +176,7 @@ Interpreter.prototype.verify = function (scriptSig, scriptPubkey, tx, nin, flags
       throw new Error('internal error - CLEANSTACK without P2SH')
     }
 
-    if (stackCopy.length !== 1) {
+    if (this.stack.length !== 1) {
       this.errstr = 'SCRIPT_ERR_CLEANSTACK'
       return false
     }