diff --git a/packages/core/src/helpers/stats.ts b/packages/core/src/helpers/stats.ts
index 0cb1f703a3..9aa50c9654 100644
--- a/packages/core/src/helpers/stats.ts
+++ b/packages/core/src/helpers/stats.ts
@@ -68,14 +68,23 @@ export const getStatsAssetsOptions = (): Rspack.StatsOptions => ({
   groupAssetsByEmitStatus: false,
 });
 
-export const getAssetsFromStats = (
-  stats: Rspack.Stats,
-): Rspack.StatsAsset[] => {
-  const statsJson = stats.toJson({
-    all: false,
-    ...getStatsAssetsOptions(),
-  });
-  return statsJson.assets || [];
+export type RsbuildAsset = {
+  /**
+   * The name of the asset.
+   * @example 'index.html', 'static/js/index.[hash].js'
+   */
+  name: string;
+  /**
+   * The size of the asset in bytes.
+   */
+  size: number;
+};
+
+export const getAssetsFromStats = (stats: Rspack.Stats): RsbuildAsset[] => {
+  return Object.entries(stats.compilation.assets).map(([name, value]) => ({
+    name,
+    size: value.size(),
+  }));
 };
 
 function getStatsOptions(
@@ -102,11 +111,6 @@ function getStatsOptions(
       // for HMR to compare the entrypoints
       entrypoints: true,
     };
-  } else if (action === 'build') {
-    defaultOptions = {
-      ...defaultOptions,
-      ...getStatsAssetsOptions(),
-    };
   }
 
   if (isMultiCompiler(compiler)) {
diff --git a/packages/core/src/plugins/fileSize.ts b/packages/core/src/plugins/fileSize.ts
index 77b04eef5a..1c3a7f8552 100644
--- a/packages/core/src/plugins/fileSize.ts
+++ b/packages/core/src/plugins/fileSize.ts
@@ -8,13 +8,13 @@ import { promisify } from 'node:util';
 import zlib from 'node:zlib';
 import { JS_REGEX } from '../constants';
 import { color } from '../helpers';
+import { getAssetsFromStats, type RsbuildAsset } from '../helpers/stats';
 import { logger } from '../logger';
 import type {
   InternalContext,
   PrintFileSizeAsset,
   PrintFileSizeOptions,
   RsbuildPlugin,
-  RsbuildStatsItem,
   Rspack,
 } from '../types';
 
@@ -93,7 +93,7 @@ const isCompressible = (assetName: string) =>
 
 async function printFileSizes(
   options: PrintFileSizeOptions,
-  stats: RsbuildStatsItem,
+  stats: Rspack.Stats,
   rootPath: string,
   distPath: string,
   environmentName: string,
@@ -109,7 +109,7 @@ async function printFileSizes(
   const exclude = options.exclude ?? excludeAsset;
   const relativeDistPath = path.relative(rootPath, distPath);
 
-  const formatAsset = async (asset: Rspack.StatsAsset) => {
+  const formatAsset = async (asset: RsbuildAsset) => {
     const fileName = asset.name.split('?')[0];
     const contents = await fs.promises.readFile(path.join(distPath, fileName));
     const size = Buffer.byteLength(contents);
@@ -135,17 +135,13 @@ async function printFileSizes(
   });
 
   const getAssets = async () => {
-    if (!stats.assets) {
-      return [];
-    }
-
-    const filteredAssets = stats.assets.filter((asset) => {
-      const assetInfo = pickAssetInfo(asset);
-      if (exclude(assetInfo)) {
+    const assets = getAssetsFromStats(stats);
+    const filteredAssets = assets.filter((asset) => {
+      if (exclude(asset)) {
         return false;
       }
       if (options.include) {
-        return options.include(assetInfo);
+        return options.include(asset);
       }
       return true;
     });
@@ -294,8 +290,8 @@ export const pluginFileSize = (context: InternalContext): RsbuildPlugin => ({
   name: 'rsbuild:file-size',
 
   setup(api) {
-    api.onAfterBuild(async ({ environments, isFirstCompile }) => {
-      const { stats, hasErrors } = context.buildState;
+    api.onAfterBuild(async ({ stats, environments, isFirstCompile }) => {
+      const { hasErrors } = context.buildState;
       // No need to print file sizes if there is any compilation error
       if (!stats || hasErrors || !isFirstCompile) {
         return;
@@ -326,7 +322,7 @@ export const pluginFileSize = (context: InternalContext): RsbuildPlugin => ({
                   ...printFileSize,
                 };
 
-          const statsItem = 'children' in stats ? stats.children[index] : stats;
+          const statsItem = 'stats' in stats ? stats.stats[index] : stats;
           const statsLogs = await printFileSizes(
             mergedConfig,
             statsItem,
diff --git a/packages/core/src/server/middlewares.ts b/packages/core/src/server/middlewares.ts
index b32981c927..7ee1d77190 100644
--- a/packages/core/src/server/middlewares.ts
+++ b/packages/core/src/server/middlewares.ts
@@ -339,7 +339,7 @@ export const viewingServedFilesMiddleware: (params: {
 
         for (const asset of assets) {
           list.push(
-            `<li><a target="_blank" href="${asset?.name}">${asset?.name}</a></li>`,
+            `<li><a target="_blank" href="${asset.name}">${asset.name}</a></li>`,
           );
         }
 
diff --git a/packages/core/src/types/config.ts b/packages/core/src/types/config.ts
index fc4e4fe1b6..cd91be553f 100644
--- a/packages/core/src/types/config.ts
+++ b/packages/core/src/types/config.ts
@@ -21,6 +21,7 @@ import type {
 import type RspackChain from '../../compiled/rspack-chain';
 import type { FileDescriptor } from '../../compiled/rspack-manifest-plugin';
 import type { BundleAnalyzerPlugin } from '../../compiled/webpack-bundle-analyzer/index.js';
+import type { RsbuildAsset } from '../helpers/stats.js';
 import type { RsbuildDevServer } from '../server/devServer';
 import type {
   EnvironmentContext,
@@ -598,17 +599,7 @@ export type BuildCacheOptions = {
   buildDependencies?: string[];
 };
 
-export type PrintFileSizeAsset = {
-  /**
-   * The name of the asset.
-   * @example 'index.html', 'static/js/index.[hash].js'
-   */
-  name: string;
-  /**
-   * The size of the asset in bytes.
-   */
-  size: number;
-};
+export type PrintFileSizeAsset = RsbuildAsset;
 
 export type PrintFileSizeOptions = {
   /**
diff --git a/packages/core/src/types/rsbuild.ts b/packages/core/src/types/rsbuild.ts
index c55ae4cc46..77cf038c96 100644
--- a/packages/core/src/types/rsbuild.ts
+++ b/packages/core/src/types/rsbuild.ts
@@ -368,7 +368,7 @@ export type RsbuildMode = 'development' | 'production' | 'none';
 
 export type RsbuildStatsItem = Pick<
   Rspack.StatsCompilation,
-  'errors' | 'warnings' | 'time' | 'entrypoints' | 'hash' | 'assets'
+  'errors' | 'warnings' | 'time' | 'entrypoints' | 'hash'
 >;
 
 /**