url('./assets/fonts/ProximaNova/Mark Simonson - Proxima Nova Alt Regular-webfont.eot?#iefix') is processed to url("Mark Simonson - Proxima Nova Alt Regular-webfont.e802340fb269d9d36021.eot”?#iefix). The quotation mark is misplaced and the font is not downloaded properly by the browser. It's working correctly once I revert back to "css-loader": "0.28.7"