diff --git a/test/mocha.opts b/test/mocha.opts
index 51c30180df..3d061f3d6e 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1,4 +1,4 @@
 --reporter dot
 --ui tdd
 --check-leaks
---globals regeneratorRuntime
+--globals regeneratorRuntime,i