diff --git a/src/emu.h b/src/emu.h
index ee09cea..e9a5b86 100644
--- a/src/emu.h
+++ b/src/emu.h
@@ -209,6 +209,7 @@ extern int	d86f_do_log;
 extern int	hdc_do_log;
 extern int	hdd_do_log;
 extern int	zip_do_log;
+extern int	mo_do_log;
 extern int	cdrom_do_log;
 extern int	cdrom_image_do_log;
 extern int	cdrom_host_do_log;