diff --git a/package.json b/package.json
index b0b3311c1a..184ca78368 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
   "scripts": {
     "build": "tsc -p tsconfig.json",
     "clean": "rm -rf ./.nyc_output ./node_modules/.cache ./coverage ./lib",
-    "prepack": "yarn build",
+    "prepack": "yarn install && yarn build",
     "mocha": "nyc mocha --config=test/.mocharc.js",
     "mocha-only": "mocha --config=test/.mocharc.js",
     "test": "yarn build && yarn test-typescript && yarn mocha",