diff --git a/lib/extension-wrapper.js b/bin/genieacs-ext
old mode 100644
new mode 100755
similarity index 96%
rename from lib/extension-wrapper.js
rename to bin/genieacs-ext
index 7e27443..43cc772
--- a/lib/extension-wrapper.js
+++ b/bin/genieacs-ext
@@ -1,3 +1,4 @@
+#!/usr/bin/env -S node -r esm
 /**
  * Copyright 2013-2018  Zaid Abdulla
  *
@@ -40,7 +41,7 @@ function errorToFault(err) {
     fault.detail.stack = err.stack;
     // Trim the stack trace
     const stackTrimIndex = fault.detail.stack.match(
-      /\s+at\s[^\s]+\s\(.*extension-wrapper\.js:.+\)/
+      /\s+at\s[^\s]+\s\(.*genieacs-ext:.+\)/
     );
     if (stackTrimIndex)
       fault.detail.stack = fault.detail.stack.slice(0, stackTrimIndex.index);
diff --git a/build/build.js b/build/build.js
index 20dfa2f..7e2e91f 100644
--- a/build/build.js
+++ b/build/build.js
@@ -158,6 +158,7 @@ async function generateToolsJs() {
 async function generateBackendJs() {
   for (const bin of [
     "genieacs-cwmp",
+    "genieacs-ext",
     "genieacs-nbi",
     "genieacs-fs",
     "genieacs-ui"
diff --git a/lib/extensions.js b/lib/extensions.js
index f1d3e83..60cf9f9 100644
--- a/lib/extensions.js
+++ b/lib/extensions.js
@@ -18,19 +18,19 @@
  */
 "use strict";
 
-import { fork } from "child_process";
+import { spawn } from "child_process";
 import crypto from "crypto";
 import * as config from "./config";
 
 const TIMEOUT = config.get("EXT_TIMEOUT");
 
 const processes = {};
-const jobs = {};
+const jobs = new Map();
 
 function messageHandler(message) {
-  const func = jobs[message[0]];
+  const func = jobs.get(message[0]);
   if (func) {
-    delete jobs[message[0]];
+    jobs.delete(message[0]);
     func(null, message[1], message[2]);
   }
 }
@@ -38,12 +38,20 @@ function messageHandler(message) {
 export function run(args, callback) {
   const scriptName = args[0];
 
+  const id = crypto.randomBytes(8).toString("hex");
+  jobs.set(id, callback);
+
   if (!processes[scriptName]) {
-    const p = fork("lib/extension-wrapper", [scriptName]);
+    const p = spawn("bin/genieacs-ext", [scriptName], {
+      stdio: ["inherit", "inherit", "inherit", "ipc"]
+    });
     processes[scriptName] = p;
 
-    p.on("error", () => {
+    p.on("error", err => {
       if (processes[scriptName] === p) {
+        if (jobs.delete(id))
+          callback(null, { code: err.name, message: err.message });
+
         kill(processes[scriptName]);
         delete processes[scriptName];
       }
@@ -59,15 +67,13 @@ export function run(args, callback) {
     p.on("message", messageHandler);
   }
 
-  const id = crypto.randomBytes(8).toString("hex");
-  jobs[id] = callback;
   setTimeout(() => {
-    if (id in jobs) {
-      delete jobs[id];
+    if (jobs.delete(id))
       callback(null, { code: "timeout", message: "Extension timed out" });
-    }
   }, TIMEOUT);
 
+  if (!processes[scriptName].connected) return false;
+
   return processes[scriptName].send([id, args.slice(1)]);
 }