diff --git a/angular-websocket.js b/angular-websocket.js
index 04e24a9..85b294a 100644
--- a/angular-websocket.js
+++ b/angular-websocket.js
@@ -346,7 +346,7 @@
       }
 
       // CommonJS
-      if (typeof exports === 'object' && require) {
+      if (typeof exports === 'object' && typeof require === 'function') {
         try {
           ws = require('ws');
           Socket = (ws.Client || ws.client || ws);
diff --git a/dist/angular-websocket.js b/dist/angular-websocket.js
index 04e24a9..85b294a 100644
--- a/dist/angular-websocket.js
+++ b/dist/angular-websocket.js
@@ -346,7 +346,7 @@
       }
 
       // CommonJS
-      if (typeof exports === 'object' && require) {
+      if (typeof exports === 'object' && typeof require === 'function') {
         try {
           ws = require('ws');
           Socket = (ws.Client || ws.client || ws);