.

package.json

@@ -8,7 +8,7 @@
     "heroku-postbuild": "babel src -d dist/transpiled_code & browserify dist/transpiled_code/SimpleDataGrapher.js -o dist/PublicLab.Grapher.js",
     "test": "./node_modules/mocha/bin/mocha --require @babel/register --require @babel/polyfill --require jsdom-global/register spec/js/",
     "lint": "eslint ./src ./dist ./spec --fix",
-    "start": "http-server -c-1 -p $process.env.NODE_PORT",
+    "start": "http-server -c-1 -p $PORT",
     "dev_start": "http-server -c-1 -p 8000"
   },
   "repository": {