diff --git a/packages/scheduler/package.json b/packages/scheduler/package.json
index 7ce0ca3b9c6a..b22fc085290e 100644
--- a/packages/scheduler/package.json
+++ b/packages/scheduler/package.json
@@ -2,6 +2,7 @@
   "name": "scheduler",
   "version": "0.20.1",
   "description": "Cooperative scheduler for the browser environment.",
+  "main": "index.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/facebook/react.git",