diff --git a/sys/dev/acpi_support/acpi_panasonic.c b/sys/dev/acpi_support/acpi_panasonic.c
index 8fea47ee45e..5f54ca07c5a 100644
--- a/sys/dev/acpi_support/acpi_panasonic.c
+++ b/sys/dev/acpi_support/acpi_panasonic.c
@@ -233,7 +233,9 @@ acpi_panasonic_shutdown(device_t dev)
 	/* Mute the main audio during reboot to prevent static burst to speaker. */
 	sc = device_get_softc(dev);
 	mute = 1;
+	ACPI_SERIAL_BEGIN(panasonic);
 	hkey_sound_mute(sc->handle, HKEY_SET, &mute);
+	ACPI_SERIAL_END(panasonic);
 	return (0);
 }