diff --git a/test/index.js b/test/index.js
index 8e2f30c0bd..b7b8518d7f 100644
--- a/test/index.js
+++ b/test/index.js
@@ -447,7 +447,7 @@ function parseArg(argv) {
       orphans = [],
       arg;
 
-  argv = argv.slice(2);
+  argv = Array.isArray(argv) ? argv.slice(2) : [];
   function getarg() {
     var arg = argv.shift();