diff --git a/util.js b/util.js
index cbc2498..4f25671 100644
--- a/util.js
+++ b/util.js
@@ -73,17 +73,17 @@ exports.format = function(f) {
 // Returns a modified function which warns once by default.
 // If --no-deprecation is set, then it is a no-op.
 exports.deprecate = function(fn, msg) {
+  if (typeof process !== 'undefined' && process.noDeprecation === true) {
+    return fn;
+  }
+
   // Allow for deprecating things in the process of starting up.
-  if (isUndefined(global.process)) {
+  if (typeof process === 'undefined') {
     return function() {
       return exports.deprecate(fn, msg).apply(this, arguments);
     };
   }
 
-  if (process.noDeprecation === true) {
-    return fn;
-  }
-
   var warned = false;
   function deprecated() {
     if (!warned) {