diff --git a/packages/react-scripts/config/webpack.config.prod.js b/packages/react-scripts/config/webpack.config.prod.js
index 4d04909a8b4..86869748c66 100644
--- a/packages/react-scripts/config/webpack.config.prod.js
+++ b/packages/react-scripts/config/webpack.config.prod.js
@@ -153,7 +153,7 @@ module.exports = {
         cache: true,
         sourceMap: shouldUseSourceMap,
       }),
-      new OptimizeCSSAssetsPlugin(),
+      new OptimizeCSSAssetsPlugin({ cssProcessorOptions: { safe: true } }),
     ],
     // Automatically split vendor and commons
     // https://twitter.com/wSokra/status/969633336732905474