diff --git a/src/sys/es/fan/Env.js b/src/sys/es/fan/Env.js
index 4e7a109b8..bb887f2cb 100644
--- a/src/sys/es/fan/Env.js
+++ b/src/sys/es/fan/Env.js
@@ -86,7 +86,7 @@ class Env extends Obj {
     else main.callOn(main.parent().make());
   }
 
-  static __isNode() { return typeof node !== "undefined"; }
+  static __isNode() { return typeof process !== "undefined"; }
 
   static __node(module=null) {
     if (typeof node === "undefined") throw UnsupportedErr.make("Only supported in Node runtime");