diff --git a/src/index.ts b/src/index.ts
index eef37b12..9ac1a4e2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -238,7 +238,7 @@ export async function build(_options: Options) {
                 // .d.ts files are removed in the `dtsTask` instead
                 // `dtsTask` is a separate process, which might start before `mainTasks`
                 if (options.dts) {
-                  extraPatterns.unshift('!**/*.d.ts')
+                  extraPatterns.unshift('!**/*.d.{ts,cts,mts}')
                 }
                 await removeFiles(['**/*', ...extraPatterns], options.outDir)
                 logger.info('CLI', 'Cleaning output folder')
diff --git a/src/rollup.ts b/src/rollup.ts
index 227fc311..fbc4d38e 100644
--- a/src/rollup.ts
+++ b/src/rollup.ts
@@ -118,7 +118,7 @@ const getRollupConfig = async (
     name: 'tsup:clean',
     async buildStart() {
       if (options.clean) {
-        await removeFiles(['**/*.d.ts'], options.outDir)
+        await removeFiles(['**/*.d.{ts,mts,cts}'], options.outDir)
       }
     },
   }
@@ -215,7 +215,7 @@ async function runRollup(options: RollupConfig) {
     logger.info('dts', 'Build start')
     const bundle = await rollup(options.inputConfig)
     const results = await Promise.all(options.outputConfig.map(bundle.write))
-    const outputs = results.flatMap((result) => result.output);
+    const outputs = results.flatMap((result) => result.output)
     logger.success('dts', `⚡️ Build success in ${getDuration()}`)
     reportSize(
       logger,