diff --git a/test/test-async.c b/test/test-async.c
index 7cdad098..9b2ce7bc 100644
--- a/test/test-async.c
+++ b/test/test-async.c
@@ -114,5 +114,7 @@ TEST_IMPL(async) {
   ASSERT(async_cb_called == 3);
   ASSERT(close_cb_called == 2);
 
+  ASSERT(0 == uv_thread_join(&thread));
+
   return 0;
 }