diff --git a/cli/src/api/artifacts.ts b/cli/src/api/artifacts.ts
index 2c3ba453..4f4b6668 100644
--- a/cli/src/api/artifacts.ts
+++ b/cli/src/api/artifacts.ts
@@ -102,7 +102,7 @@ export async function collectArtifacts(userOptions: ArtifactsOptions) {
     )
     const browserWorkerFile = join(
       options.buildOutputDir ?? options.cwd,
-      `wasi-worker-browser.js`,
+      `wasi-worker-browser.mjs`,
     )
     debug.info(
       `Move wasi binding file [${colors.yellowBright(