diff --git a/packages/core/build/src/buildClient.ts b/packages/core/build/src/buildClient.ts
index a69b90bf06..eb732d0793 100644
--- a/packages/core/build/src/buildClient.ts
+++ b/packages/core/build/src/buildClient.ts
@@ -66,11 +66,11 @@ function buildClientEsm(cwd: string, userConfig: UserConfig, sourcemap: boolean,
     module: {
       rules: [
         {
-          test: /.less$/,
+          test: /\.less$/,
           use: [
             { loader: 'style-loader' },
             { loader: 'css-loader' },
-            { loader: 'less-loader' },
+            { loader: require.resolve('less-loader') },
             {
               loader: 'postcss-loader',
               options: {
diff --git a/packages/core/build/src/buildEsm.ts b/packages/core/build/src/buildEsm.ts
index 8d8176cc0b..4a773c7066 100644
--- a/packages/core/build/src/buildEsm.ts
+++ b/packages/core/build/src/buildEsm.ts
@@ -82,11 +82,11 @@ function build(
     module: {
       rules: [
         {
-          test: /.less$/,
+          test: /\.less$/,
           use: [
             { loader: 'style-loader' },
             { loader: 'css-loader' },
-            { loader: 'less-loader' },
+            { loader: require.resolve('less-loader') },
             {
               loader: 'postcss-loader',
               options: {
diff --git a/packages/core/build/src/buildPlugin.ts b/packages/core/build/src/buildPlugin.ts
index 2ad07e235a..a43c14b23b 100644
--- a/packages/core/build/src/buildPlugin.ts
+++ b/packages/core/build/src/buildPlugin.ts
@@ -354,11 +354,11 @@ export async function buildPluginClient(cwd: string, userConfig: UserConfig, sou
     module: {
       rules: [
         {
-          test: /.less$/,
+          test: /\.less$/,
           use: [
             { loader: 'style-loader' },
             { loader: 'css-loader' },
-            { loader: 'less-loader' },
+            { loader: require.resolve('less-loader') },
             {
               loader: 'postcss-loader',
               options: {