diff --git a/lib/make/mb_openmsx.mk b/lib/make/mb_openmsx.mk
index 3bd145d..07f0730 100644
--- a/lib/make/mb_openmsx.mk
+++ b/lib/make/mb_openmsx.mk
@@ -51,6 +51,7 @@ define _mb_openmsx_run
 		-script $(PATH_MSXBUILD_REAL)/lib/openmsx/boot_hdd.tcl \
 		-script $(PATH_MSXBUILD_REAL)/lib/openmsx/fail_after.tcl \
 		-setting $(PATH_MSXBUILD_REAL)/lib/openmsx/boot_setting.xml \
+		-command "set sound_driver null" \
 	-control stdio < $(PATH_MSXBUILD_REAL)/lib/openmsx/boot_stdio.xml
 endef