diff --git a/test/napi/napi-app/async_finalize_addon.cpp b/test/napi/napi-app/async_finalize_addon.cpp
index 9615326dcd..01be32034c 100644
--- a/test/napi/napi-app/async_finalize_addon.cpp
+++ b/test/napi/napi-app/async_finalize_addon.cpp
@@ -73,6 +73,7 @@ static void buffer_finalizer(napi_env env, void *data, void *hint) {
   } else {
     printf("buffer_finalizer run from another thread\n");
   }
+  fflush(stdout);
   free(data);
   buffer_finalize_count++;
 }