diff --git a/webpack.config.js b/webpack.config.js
index 545fddb8d..683dc97ae 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -76,7 +76,9 @@ async function webpackConfig() {
                  { loader: 'css-loader', options: { sourceMap: true }},
                  { loader: 'postcss-loader', options: {
                      sourceMap: true,
-                     plugins: () => [ postcssPresetEnv ]
+                     postcssOptions:  {
+                       plugins: [ 'postcss-preset-env' ]
+                     }
                  }},
                  { loader: 'resolve-url-loader', options: { sourceMap: true }}
                ]
@@ -87,7 +89,9 @@ async function webpackConfig() {
                  { loader: 'css-loader', options: { sourceMap: true }},
                  { loader: 'postcss-loader', options: {
                      sourceMap: true,
-                     plugins: () => [ postcssPresetEnv ]
+                     postcssOptions:  {
+                       plugins: [ 'postcss-preset-env' ]
+                     }
                  }},
                  { loader: 'resolve-url-loader', options: { sourceMap: true }},
                  { loader: 'sass-loader', options: { implementation: require('sass'), sourceMap: true }}