diff --git a/packages/kit/src/config/schema/build.ts b/packages/kit/src/config/schema/build.ts
index 11d3f6b276..693120d7cd 100644
--- a/packages/kit/src/config/schema/build.ts
+++ b/packages/kit/src/config/schema/build.ts
@@ -291,7 +291,7 @@ export default {
   optimization: {
     runtimeChunk: 'single',
     /** Set minimize to false to disable all minimizers. (It is disabled in development by default) */
-    minimize: { $resolve: (val, get) => val ?? get('dev') },
+    minimize: { $resolve: (val, get) => val ?? !get('dev') },
     /** You can set minimizer to a customized array of plugins. */
     minimizer: undefined,
     splitChunks: {
diff --git a/packages/webpack/src/configs/client.ts b/packages/webpack/src/configs/client.ts
index fb65be6cd3..95f45b1261 100644
--- a/packages/webpack/src/configs/client.ts
+++ b/packages/webpack/src/configs/client.ts
@@ -71,14 +71,7 @@ function clientHMR (ctx: WebpackConfigContext) {
   config.plugins.push(new webpack.HotModuleReplacementPlugin())
 }
 
-function clientOptimization (ctx: WebpackConfigContext) {
-  const { options, config } = ctx
-
-  config.optimization = {
-    ...config.optimization,
-    ...options.build.optimization as any
-  }
-
+function clientOptimization (_ctx: WebpackConfigContext) {
   // TODO: Improve optimization.splitChunks.cacheGroups
 }