diff --git a/q.js b/q.js
index d9405fdc..458c6711 100644
--- a/q.js
+++ b/q.js
@@ -157,9 +157,16 @@ var nextTick =(function () {
         }
     };
 
-    if (typeof process !== "undefined" && process.nextTick) {
-        // Node.js before 0.9. Note that some fake-Node environments, like the
-        // Mocha test runner, introduce a `process` global without a `nextTick`.
+    if (typeof process === "object" &&
+        process.toString() === '[object process]' && process.nextTick) {
+        // Ensure Q is in a real Node environment, with a `process.nextTick`.
+        // To see through fake Node environments:
+        // * Mocha test runner - exposes a `process` global without a `nextTick`
+        // * Browserify - exposes a `process.nexTick` function that uses
+        //   `setTimeout`. In this case `setImmediate` is preferred because
+        //    it is faster. Browserify's `process.toString()` yields
+        //   '[object Object]', while in a real Node environment
+        //   `process.nextTick()` yields '[object process]'.
         isNodeJS = true;
 
         requestTick = function () {