diff --git a/src/gui/midi_win32.h b/src/gui/midi_win32.h
index 5f30c293..5f6e1d1d 100644
--- a/src/gui/midi_win32.h
+++ b/src/gui/midi_win32.h
@@ -18,7 +18,6 @@
 
 #include <windows.h>
 #include <mmsystem.h>
-#include <mmreg.h>
 
 static HMIDIOUT m_out;
 static MIDIHDR m_hdr;