diff --git a/e2e/cases/dts/index.test.ts b/e2e/cases/dts/index.test.ts
index 4aa50d7cc..08e0a903d 100644
--- a/e2e/cases/dts/index.test.ts
+++ b/e2e/cases/dts/index.test.ts
@@ -90,7 +90,7 @@ describe('dts when bundle: true', () => {
       'dts',
     );
 
-    expect(entryFiles.esm).toEqual('./dist/esm/index.d.ts');
+    expect(entryFiles.esm).toEqual('./dist/esm/main.d.ts');
     expect(entries).toMatchSnapshot();
   });
 
@@ -113,7 +113,7 @@ describe('dts when bundle: true', () => {
       'dts',
     );
 
-    expect(entryFiles.esm).toEqual('./dist/custom/index.d.ts');
+    expect(entryFiles.esm).toEqual('./dist/custom/main.d.ts');
   });
 
   test('abortOnError: false', async () => {
@@ -135,7 +135,7 @@ describe('dts when bundle: true', () => {
       'dts',
     );
 
-    expect(entryFiles.cjs).toEqual('./dist/cjs/index.d.cts');
+    expect(entryFiles.cjs).toEqual('./dist/cjs/main.d.cts');
   });
 
   test('bundleName -- set source.entry', async () => {
diff --git a/packages/plugin-dts/src/apiExtractor.ts b/packages/plugin-dts/src/apiExtractor.ts
index 0426f6750..60ee74bdd 100644
--- a/packages/plugin-dts/src/apiExtractor.ts
+++ b/packages/plugin-dts/src/apiExtractor.ts
@@ -14,7 +14,7 @@ export type BundleOptions = {
   cwd: string;
   outDir: string;
   dtsExtension: string;
-  dtsEntry: DtsEntry;
+  dtsEntry: Required<DtsEntry>;
   tsconfigPath?: string;
 };
 
@@ -24,7 +24,10 @@ export async function bundleDts(options: BundleOptions): Promise<void> {
     cwd,
     outDir,
     dtsExtension,
-    dtsEntry,
+    dtsEntry = {
+      name: 'index',
+      path: 'index.d.ts',
+    },
     tsconfigPath = 'tsconfig.json',
   } = options;
   try {
@@ -32,9 +35,9 @@ export async function bundleDts(options: BundleOptions): Promise<void> {
     const untrimmedFilePath = join(
       cwd,
       relative(cwd, outDir),
-      `${dtsEntry.name ?? 'index'}${dtsExtension}`,
+      `${dtsEntry.name}${dtsExtension}`,
     );
-    const mainEntryPointFilePath = dtsEntry.path ?? 'index.d.ts';
+    const mainEntryPointFilePath = dtsEntry.path;
     const internalConfig = {
       mainEntryPointFilePath,
       // TODO: use !externals