diff --git a/package.json b/package.json
index fa03b14..5dd5fb2 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "typecheck": "tsc --noEmit -p tsconfig.json",
     "start": "npm run build && npm run server",
     "release": "./release.sh",
+    "prepublishOnly": "npm run build",
     "postinstall": "node scripts/fix-node-pty.js"
   },
   "keywords": [