diff --git a/lib/https.js b/lib/https.js
index d8b42c85493f7e..6de78f454e165a 100644
--- a/lib/https.js
+++ b/lib/https.js
@@ -350,7 +350,7 @@ Agent.prototype._evictSession = function _evictSession(key) {
   delete this._sessionCache.map[key];
 };
 
-const globalAgent = new Agent({ keepAlive: true, scheduling: 'lifo', timeout: 5000 });
+let globalAgent = new Agent({ keepAlive: true, scheduling: 'lifo', timeout: 5000 });
 
 /**
  * Makes a request to a secure web server.
@@ -415,9 +415,21 @@ function get(input, options, cb) {
 
 module.exports = {
   Agent,
-  globalAgent,
   Server,
   createServer,
   get,
   request,
 };
+
+// make https.globalAgent overridable also under ECMAScript Modules
+ObjectDefineProperty(module.exports, 'globalAgent', {
+  __proto__: null,
+  configurable: true,
+  enumerable: true,
+  get() {
+    return globalAgent;
+  },
+  set(value) {
+    globalAgent = value;
+  },
+});