diff --git a/config/webpack.config.dev.js b/config/webpack.config.dev.js
index 65b3936ccb8..2a163eb4fa0 100644
--- a/config/webpack.config.dev.js
+++ b/config/webpack.config.dev.js
@@ -67,7 +67,7 @@ module.exports = {
       },
       {
         test: /\.css$/,
-        include: srcPath,
+        include: [srcPath, nodeModulesPath],
         loader: 'style!css!postcss'
       },
       {
diff --git a/config/webpack.config.prod.js b/config/webpack.config.prod.js
index f372286a279..94f64b087bc 100644
--- a/config/webpack.config.prod.js
+++ b/config/webpack.config.prod.js
@@ -63,7 +63,7 @@ module.exports = {
       },
       {
         test: /\.css$/,
-        include: srcPath,
+        include: [srcPath, nodeModulesPath],
         // Disable autoprefixer in css-loader itself:
         // https://github.com/webpack/css-loader/issues/281
         // We already have it thanks to postcss.