diff --git a/npm/shellroute/bin/shellroute b/npm/shellroute/bin/shellroute
index 98030c6..5ebfcfe 100755
--- a/npm/shellroute/bin/shellroute
+++ b/npm/shellroute/bin/shellroute
@@ -1,25 +1,25 @@
 #!/usr/bin/env node
-const { execFileSync } = require("child_process");
-const path = require("path");
-const os = require("os");
+var execFileSync = require("child_process").execFileSync;
+var path = require("path");
+var os = require("os");
 
-const PLATFORMS = {
+var PLATFORMS = {
   "darwin-arm64":  "@shellroute/cli-darwin-arm64",
   "darwin-x64":    "@shellroute/cli-darwin-x64",
   "linux-arm64":   "@shellroute/cli-linux-arm64",
   "linux-x64":     "@shellroute/cli-linux-x64",
 };
 
-const key = `${os.platform()}-${os.arch()}`;
-const pkg = PLATFORMS[key];
+var key = os.platform() + "-" + os.arch();
+var pkg = PLATFORMS[key];
 if (!pkg) {
-  console.error(`Unsupported platform: ${key}`);
+  console.error("Unsupported platform: " + key);
   process.exit(1);
 }
 
 try {
-  const binPath = path.join(require.resolve(`${pkg}/package.json`), "..", "bin", "shellroute");
+  var binPath = path.join(require.resolve(pkg + "/package.json"), "..", "bin", "shellroute");
   execFileSync(binPath, process.argv.slice(2), { stdio: "inherit" });
 } catch (e) {
-  process.exit(e.status ?? 1);
+  process.exit(e.status != null ? e.status : 1);
 }