diff --git a/src/script.js b/src/script.js
index 2004fa1..3239e37 100644
--- a/src/script.js
+++ b/src/script.js
@@ -13,7 +13,7 @@ var REVERSE_OPS = (function () {
   return result
 })()
 
-const OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
+var OP_INT_BASE = OPS.OP_RESERVED // OP_1 - 1
 
 function toASM (chunks) {
   if (types.Buffer(chunks)) {