There are a couple of issues where this appears to be the solution. See: https://github.com/facebook/create-react-app/issues/4494#issuecomment-441464956 and https://github.com/facebook/create-react-app/pull/5599#issuecomment-433996606 We should add this to the Sass docs: https://facebook.github.io/create-react-app/docs/adding-a-sass-stylesheet