diff --git a/src/test/ReactPerf.js b/src/test/ReactPerf.js
index 75f9aeff2fbc4..beb60e1573448 100644
--- a/src/test/ReactPerf.js
+++ b/src/test/ReactPerf.js
@@ -68,7 +68,7 @@ var ReactPerf = {
 
 if (__DEV__) {
   var ExecutionEnvironment = require('ExecutionEnvironment');
-  var URL = ExecutionEnvironment.canUseDOM ? window.location.href : '';
+  var URL = (ExecutionEnvironment.canUseDOM && window.location.href) || '';
   ReactPerf.enableMeasure = ReactPerf.enableMeasure ||
     !!URL.match(/[?&]react_perf\b/);
 }