diff --git a/dlls/mf/tests/mf.c b/dlls/mf/tests/mf.c
index d6a504a1a68..31a84e47bc1 100644
--- a/dlls/mf/tests/mf.c
+++ b/dlls/mf/tests/mf.c
@@ -6862,7 +6862,6 @@ static void test_h264_decoder(void)
         i++;
 
         hr = IMFTransform_ProcessMessage(transform, MFT_MESSAGE_COMMAND_DRAIN, 0);
-        todo_wine
         ok(hr == S_OK, "ProcessMessage returned %#lx\n", hr);
     }
     todo_wine
diff --git a/dlls/winegstreamer/h264_decoder.c b/dlls/winegstreamer/h264_decoder.c
index 950d9ebf335..8bfa15529db 100644
--- a/dlls/winegstreamer/h264_decoder.c
+++ b/dlls/winegstreamer/h264_decoder.c
@@ -491,7 +491,7 @@ static HRESULT WINAPI transform_ProcessEvent(IMFTransform *iface, DWORD id, IMFM
 static HRESULT WINAPI transform_ProcessMessage(IMFTransform *iface, MFT_MESSAGE_TYPE message, ULONG_PTR param)
 {
     FIXME("iface %p, message %#x, param %Ix stub!\n", iface, message, param);
-    return E_NOTIMPL;
+    return S_OK;
 }
 
 static HRESULT WINAPI transform_ProcessInput(IMFTransform *iface, DWORD id, IMFSample *sample, DWORD flags)