--- a/src/MixerBoard.cpp
+++ b/src/MixerBoard.cpp
@@ -1304,7 +1304,7 @@
    wxMemoryDC dc;
 
    for (const auto &data : table) {
-      auto bmp = std::make_unique<wxBitmap>(data.bitmap,24);
+      auto bmp = std::make_unique<wxBitmap>(data.bitmap);
       dc.SelectObject(*bmp);
       AColor::Bevel(dc, false, bev);
       mMusicalInstruments.push_back(std::make_unique<MusicalInstrument>(
