diff --git a/src/performance.js b/src/performance.js
index fe79a59..16727b8 100644
--- a/src/performance.js
+++ b/src/performance.js
@@ -1,11 +1,8 @@
-
-/*global global */
-
 let perf = null, start = Date.now();
 
 // use global browser performance module
 // for node create a polyfill
-if (!global) {
+if (typeof window !== 'undefined' && window.performance) {
   perf = window.performance;
 } else {
   perf = {
@@ -15,4 +12,4 @@ if (!global) {
   };
 }
 
-export default perf;
\ No newline at end of file
+export default perf;