diff --git a/package-overrides/npm/mocha@1.21.4.json b/package-overrides/npm/mocha@1.21.4.json
index 5b01c49..327a3cf 100644
--- a/package-overrides/npm/mocha@1.21.4.json
+++ b/package-overrides/npm/mocha@1.21.4.json
@@ -1,5 +1,6 @@
 {
   "browser": "mocha",
+  "main": "mocha",
   "shim": {
     "mocha": {
       "deps": ["./mocha.css!"],