WebStorm auto-suggesting ES5 types lib instead of later

I have a project targeting ES2016 with the following tsconfig compiler options:

"compilerOptions": {
  "target": "es2016",
  "module": "commonjs",
  "lib": ["es2016"]
}

WebStorm's suggestions however keep popping up for lib.es5. For example, here's Object:

Is there a setting I am missing? Something in the config?