diff --git a/lib/script/script.js b/lib/script/script.js
index fa5427f..dc7fc9a 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -1144,19 +1144,4 @@ Script.prototype.getSignatureOperationsCount = function(accurate) {
   return n;
 };
 
-Script.prototype.witnessSignatureOperationsCount = function (version, program, witness, flags) {
-  if (version == 0) {
-    if (program.length == 20) {
-      return 1;
-    }
-
-    if (program.length == 32 && witness.size > 0) {
-      var subscript = new Script(witness.back);
-      return subscript.getSignatureOperationsCount(true);
-    }
-  }
-
-  return 0;
-};
-
 module.exports = Script;