diff --git a/package.json b/package.json
index 42caa9013d..84724e4a56 100644
--- a/package.json
+++ b/package.json
@@ -54,6 +54,7 @@
     "eslint-plugin-react-internal": "file:./eslint-rules",
     "fbjs": "^0.8.9",
     "fbjs-scripts": "^0.6.0",
+    "filesize": "^3.5.6",
     "flow-bin": "^0.41.0",
     "glob": "^6.0.4",
     "glob-stream": "^6.1.0",