diff --git a/lib/parallel.js b/lib/parallel.js
index f18ec13..b0a9fc7 100644
--- a/lib/parallel.js
+++ b/lib/parallel.js
@@ -1,6 +1,6 @@
 (function() {
   const isCommonJS = typeof module !== 'undefined' && module.exports;
-  const isNode = !(typeof window !== 'undefined' && this === window);
+  const isNode = typeof process !== 'undefined' && process.release && process.release.name === 'node';
   var setImmediate =
     setImmediate ||
     function(cb) {