diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 4b12808bddab..cfeed1c45b54 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -5572,6 +5572,7 @@ static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
 static struct tpacpi_led_classdev tpacpi_led_thinklight = {
 	.led_classdev = {
 		.name		= "tpacpi::thinklight",
+		.max_brightness	= 1,
 		.brightness_set_blocking = &light_sysfs_set,
 		.brightness_get	= &light_sysfs_get,
 	}