diff --git a/dlls/amstream/multimedia.c b/dlls/amstream/multimedia.c
index 967baacb747..f927cd106a0 100644
--- a/dlls/amstream/multimedia.c
+++ b/dlls/amstream/multimedia.c
@@ -472,6 +472,17 @@ static HRESULT WINAPI multimedia_stream_OpenFile(IAMMultiMediaStream *iface,
         }
     }
 
+    if (SUCCEEDED(ret) && (flags & AMMSF_NOCLOCK))
+    {
+        IMediaFilter *media_filter;
+
+        if (SUCCEEDED(ret = IGraphBuilder_QueryInterface(This->graph, &IID_IMediaFilter, (void **)&media_filter)))
+        {
+            ret = IMediaFilter_SetSyncSource(media_filter, NULL);
+            IMediaFilter_Release(media_filter);
+        }
+    }
+
     IMediaStreamFilter_SupportSeeking(This->filter, This->type == STREAMTYPE_READ);
 
     if (SUCCEEDED(ret) && (flags & AMMSF_RUN))
diff --git a/dlls/amstream/tests/amstream.c b/dlls/amstream/tests/amstream.c
index bd4f94f7327..fbfd899fe29 100644
--- a/dlls/amstream/tests/amstream.c
+++ b/dlls/amstream/tests/amstream.c
@@ -418,6 +418,8 @@ static void test_openfile(const WCHAR *test_avi_path)
     IAMMultiMediaStream *mmstream = create_ammultimediastream();
     IMediaControl *media_control;
     IMediaStreamFilter *filter;
+    IMediaFilter *media_filter;
+    IReferenceClock *clock;
     IGraphBuilder *graph;
     OAFilterState state;
     HRESULT hr;
@@ -475,6 +477,11 @@ static void test_openfile(const WCHAR *test_avi_path)
     mmstream = create_ammultimediastream();
     hr = IAMMultiMediaStream_AddMediaStream(mmstream, NULL, &MSPID_PrimaryAudio, 0, NULL);
     ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IAMMultiMediaStream_GetFilterGraph(mmstream, &graph);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(!!graph, "Expected non-NULL graph.\n");
+    hr = IGraphBuilder_QueryInterface(graph, &IID_IMediaFilter, (void **)&media_filter);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
     hr = IAMMultiMediaStream_GetFilter(mmstream, &filter);
     ok(hr == S_OK, "Got hr %#x.\n", hr);
 
@@ -485,10 +492,25 @@ static void test_openfile(const WCHAR *test_avi_path)
 
     check_interface(filter, &IID_IMediaSeeking, TRUE);
 
+    hr = IAMMultiMediaStream_SetState(mmstream, STREAMSTATE_RUN);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    clock = NULL;
+    IMediaFilter_GetSyncSource(media_filter, &clock);
+    ok(!!clock, "Expected non-NULL clock.\n");
+
+    hr = IAMMultiMediaStream_SetState(mmstream, STREAMSTATE_STOP);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
     ref = IAMMultiMediaStream_Release(mmstream);
     ok(!ref, "Got outstanding refcount %d.\n", ref);
+    IMediaFilter_Release(media_filter);
+    ref = IGraphBuilder_Release(graph);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
     ref = IMediaStreamFilter_Release(filter);
     ok(!ref, "Got outstanding refcount %d.\n", ref);
+    ref = IReferenceClock_Release(clock);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
 
     mmstream = create_ammultimediastream();
     hr = IAMMultiMediaStream_AddMediaStream(mmstream, NULL, &MSPID_PrimaryAudio, 0, NULL);
@@ -512,6 +534,34 @@ static void test_openfile(const WCHAR *test_avi_path)
     IMediaControl_Release(media_control);
     ref = IGraphBuilder_Release(graph);
     ok(!ref, "Got outstanding refcount %d.\n", ref);
+
+    mmstream = create_ammultimediastream();
+    hr = IAMMultiMediaStream_AddMediaStream(mmstream, NULL, &MSPID_PrimaryAudio, 0, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IAMMultiMediaStream_GetFilterGraph(mmstream, &graph);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(!!graph, "Expected non-NULL graph.\n");
+    hr = IGraphBuilder_QueryInterface(graph, &IID_IMediaFilter, (void **)&media_filter);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMultiMediaStream_OpenFile(mmstream, test_avi_path, AMMSF_NOCLOCK);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMultiMediaStream_SetState(mmstream, STREAMSTATE_RUN);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    clock = (IReferenceClock *)0xdeadbeef;
+    IMediaFilter_GetSyncSource(media_filter, &clock);
+    ok(!clock, "Got clock %p.\n", clock);
+
+    hr = IAMMultiMediaStream_SetState(mmstream, STREAMSTATE_STOP);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    ref = IAMMultiMediaStream_Release(mmstream);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
+    IMediaFilter_Release(media_filter);
+    ref = IGraphBuilder_Release(graph);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
 }
 
 static void test_mmstream_get_duration(const WCHAR *test_avi_path)