diff --git a/dlls/amstream/mediastream.c b/dlls/amstream/mediastream.c
index 586e00f4fb2..0e2253723b7 100644
--- a/dlls/amstream/mediastream.c
+++ b/dlls/amstream/mediastream.c
@@ -523,9 +523,15 @@ static HRESULT WINAPI AudioMediaStreamImpl_IAMMediaStream_GetMultiMediaStream(IA
 {
     AudioMediaStreamImpl *This = impl_from_AudioMediaStream_IAMMediaStream(iface);
 
-    FIXME("(%p/%p)->(%p) stub!\n", This, iface, multi_media_stream);
+    TRACE("(%p/%p)->(%p)\n", This, iface, multi_media_stream);
 
-    return S_FALSE;
+    if (!multi_media_stream)
+        return E_POINTER;
+
+    IMultiMediaStream_AddRef(This->parent);
+    *multi_media_stream = This->parent;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI AudioMediaStreamImpl_IAMMediaStream_GetInformation(IAMMediaStream *iface,
diff --git a/dlls/amstream/tests/amstream.c b/dlls/amstream/tests/amstream.c
index 3cdb77fc631..e026e800a8f 100644
--- a/dlls/amstream/tests/amstream.c
+++ b/dlls/amstream/tests/amstream.c
@@ -373,16 +373,13 @@ static void test_media_streams(void)
         ok((void*)am_media_stream == (void*)audio_stream, "Not same interface, got %p expected %p\n", am_media_stream, audio_stream);
 
         hr = IAMMediaStream_GetMultiMediaStream(am_media_stream, NULL);
-        todo_wine ok(hr == E_POINTER, "Expected E_POINTER, got %x\n", hr);
+        ok(hr == E_POINTER, "Expected E_POINTER, got %x\n", hr);
 
         multi_media_stream = (void *)0xdeadbeef;
         hr = IAMMediaStream_GetMultiMediaStream(am_media_stream, &multi_media_stream);
-        todo_wine ok(hr == S_OK, "IAMMediaStream_GetMultiMediaStream returned: %x\n", hr);
-        if (hr == S_OK)
-        {
-            ok((void *)multi_media_stream == (void *)pams, "Expected %p, got %p\n", pams, multi_media_stream);
-            IMultiMediaStream_Release(multi_media_stream);
-        }
+        ok(hr == S_OK, "IAMMediaStream_GetMultiMediaStream returned: %x\n", hr);
+        ok((void *)multi_media_stream == (void *)pams, "Expected %p, got %p\n", pams, multi_media_stream);
+        IMultiMediaStream_Release(multi_media_stream);
 
         IAMMediaStream_Release(am_media_stream);