diff --git a/Gruntfile.js b/Gruntfile.js
index bfb950c..aff8e3f 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -70,7 +70,7 @@ module.exports = function(grunt) {
           version         : '0.36.9',
           platform        : 'darwin',
           arch            : 'x64',
-          // ignore          : 'node_modules/',
+          prune           : true,
           'app-version'   : packageJson.version,
           'app-bundle-id' : 'com.gillesdemey.cumulus'
         }
diff --git a/package.json b/package.json
index c93198f..ffc6d54 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "start": "grunt",
     "build:osx": "grunt build:osx && cp ./cumulus.icns dist/Cumulus.app/Contents/Resources/atom.icns && npm run package:osx",
-    "package:osx": "zip -r -X dist/Cumulus-$npm_package_version-osx.zip dist/Cumulus.app"
+    "package:osx": "hdiutil create -format UDZO -volname Cumulus -srcfolder dist dist/Cumulus-$npm_package_version-osx.dmg"
   },
   "devDependencies": {
     "browserify": "^10.0.0",