diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..2ad8641
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,2 @@
+node_modules
+__test__
\ No newline at end of file
diff --git a/package.json b/package.json
index 5b0e4da..6955784 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,9 @@
   "scripts": {
     "rollup": "NODE_ENV=production rollup -c rollup.config.js -m -f cjs -n $npm_package_amdName $npm_package_jsnext_main -o $npm_package_main",
     "minify": "uglifyjs $npm_package_main -cm toplevel -o $npm_package_main -p relative --in-source-map ${npm_package_main}.map --source-map ${npm_package_main}.map",
-    "build": "yarn rollup && yarn minify && gzip-size dist/tinytime.js | pretty-bytes",
-    "test": "NODE_ENV=test flow && jest"
+    "build": "npm run rollup && npm run minify && gzip-size dist/tinytime.js | pretty-bytes",
+    "test": "NODE_ENV=test flow && jest",
+    "prepublish": "npm run build"
   },
   "devDependencies": {
     "babel-core": "^6.21.0",