diff --git a/test/mocha.conf.js b/test/mocha.conf.js
index fd1766e7c..597f2ea60 100644
--- a/test/mocha.conf.js
+++ b/test/mocha.conf.js
@@ -1 +1,3 @@
-window.mocha.setup({ timeout: 5000 });
+if (typeof window != 'undefined') {
+  window.mocha.setup({ timeout: 5000 });
+}