diff --git a/dlls/amstream/tests/amstream.c b/dlls/amstream/tests/amstream.c
index 5226a072364..ceb72c720ab 100644
--- a/dlls/amstream/tests/amstream.c
+++ b/dlls/amstream/tests/amstream.c
@@ -8511,6 +8511,22 @@ static void test_ddrawstreamsample_update(void)
     hr = IAMMultiMediaStream_SetState(mmstream, STREAMSTATE_RUN);
     ok(hr == S_OK, "Got hr %#x.\n", hr);
 
+    hr = IDirectDrawStreamSample_Update(stream_sample, 0, event, NULL, 0);
+    todo_wine ok(hr == MS_S_PENDING, "Got hr %#x.\n", hr);
+
+    ok(WaitForSingleObject(event, 0) == WAIT_TIMEOUT, "Event should not be signaled.\n");
+
+    if (hr == MS_S_PENDING)
+    {
+        media_sample = ammediastream_allocate_sample(&source, test_data, sizeof(test_data));
+        hr = IMemInputPin_Receive(source.source.pMemInputPin, media_sample);
+        ok(hr == S_OK, "Got hr %#x.\n", hr);
+        ref = IMediaSample_Release(media_sample);
+        ok(!ref, "Got outstanding refcount %d.\n", ref);
+    }
+
+    todo_wine ok(WaitForSingleObject(event, 0) == 0, "Event should be signaled.\n");
+
     hr = IDirectDrawStreamSample_Update(stream_sample, SSUPDATE_ASYNC, NULL, NULL, 0);
     ok(hr == MS_S_PENDING, "Got hr %#x.\n", hr);
     EXPECT_REF(stream_sample, 1);