diff --git a/scripts/build/config.mjs b/scripts/build/config.mjs
index 201b5573c..cb7297dda 100644
--- a/scripts/build/config.mjs
+++ b/scripts/build/config.mjs
@@ -95,6 +95,10 @@ const parsers = [
   },
   {
     input: "src/language-js/parse/espree.js",
+    replace: {
+      "const Syntax = ": "const Syntax = undefined && ",
+      "var visitorKeys = ": "var visitorKeys = undefined && ",
+    },
   },
   {
     input: "src/language-js/parse/meriyah.js",