1 files changed, 1 insertions, 1 deletions
diff --git a/simon/midi.h b/simon/midi.h
index 95637f2c91..fb6d9f3e4f 100644
--- a/simon/midi.h
+++ b/simon/midi.h
@@ -48,7 +48,7 @@ struct MusicInfo {
 class MidiPlayer : public MidiDriver {
 protected:
 	OSystem *_system;
-	void *_mutex;
+	OSystem::MutexRef _mutex;
 	MidiDriver *_driver;
 
 	MusicInfo _music;