diff --git a/dlls/amstream/audiostream.c b/dlls/amstream/audiostream.c
index 1f9aed7338c..4e34b2549eb 100644
--- a/dlls/amstream/audiostream.c
+++ b/dlls/amstream/audiostream.c
@@ -184,6 +184,7 @@ struct audio_stream
     IMemAllocator *allocator;
     AM_MEDIA_TYPE mt;
     WAVEFORMATEX format;
+    FILTER_STATE state;
 };
 
 static inline struct audio_stream *impl_from_IAMMediaStream(IAMMediaStream *iface)
@@ -340,11 +341,17 @@ static HRESULT WINAPI audio_IAMMediaStream_Initialize(IAMMediaStream *iface, IUn
 
 static HRESULT WINAPI audio_IAMMediaStream_SetState(IAMMediaStream *iface, FILTER_STATE state)
 {
-    struct audio_stream *This = impl_from_IAMMediaStream(iface);
+    struct audio_stream *stream = impl_from_IAMMediaStream(iface);
 
-    FIXME("(%p/%p)->(%u) stub!\n", This, iface, state);
+    TRACE("stream %p, state %u.\n", stream, state);
 
-    return S_FALSE;
+    EnterCriticalSection(&stream->cs);
+
+    stream->state = state;
+
+    LeaveCriticalSection(&stream->cs);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI audio_IAMMediaStream_JoinAMMultiMediaStream(IAMMediaStream *iface,
diff --git a/dlls/amstream/tests/amstream.c b/dlls/amstream/tests/amstream.c
index 82a833ad6f9..472c6558fc4 100644
--- a/dlls/amstream/tests/amstream.c
+++ b/dlls/amstream/tests/amstream.c
@@ -2780,6 +2780,40 @@ static void test_audiostream_receive_connection(void)
     ok(!ref, "Got outstanding refcount %d.\n", ref);
 }
 
+static void test_audiostream_set_state(void)
+{
+    IAMMultiMediaStream *mmstream = create_ammultimediastream();
+    IAMMediaStream *am_stream;
+    IMediaStream *stream;
+    HRESULT hr;
+    ULONG ref;
+
+    hr = IAMMultiMediaStream_Initialize(mmstream, STREAMTYPE_READ, 0, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IAMMultiMediaStream_AddMediaStream(mmstream, NULL, &MSPID_PrimaryAudio, 0, &stream);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IMediaStream_QueryInterface(stream, &IID_IAMMediaStream, (void **)&am_stream);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMediaStream_SetState(am_stream, 4);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMediaStream_SetState(am_stream, State_Running);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMediaStream_SetState(am_stream, State_Paused);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IAMMediaStream_SetState(am_stream, State_Stopped);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    ref = IAMMultiMediaStream_Release(mmstream);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
+    IAMMediaStream_Release(am_stream);
+    ref = IMediaStream_Release(stream);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
+}
+
 void test_mediastreamfilter_get_state(void)
 {
     IAMMultiMediaStream *mmstream = create_ammultimediastream();
@@ -2951,6 +2985,7 @@ START_TEST(amstream)
     test_audiostream_get_format();
     test_audiostream_set_format();
     test_audiostream_receive_connection();
+    test_audiostream_set_state();
 
     test_mediastreamfilter_get_state();
     test_mediastreamfilter_stop_pause_run();