diff --git a/test/fixture/build.config.ts b/test/fixture/build.config.ts
index 4cdf6438..7be9cc24 100644
--- a/test/fixture/build.config.ts
+++ b/test/fixture/build.config.ts
@@ -22,6 +22,7 @@ export default defineBuildConfig([
     entries: ["src/index"],
     outDir: "dist/min",
     sourcemap: true,
+    declaration: true,
     rollup: {
       esbuild: {
         minify: true,