diff --git a/src/mainboard/intel/kunimitsu/acpi/ec.asl b/src/mainboard/intel/kunimitsu/acpi/ec.asl
index 63c45deadb..10ca834a2c 100644
--- a/src/mainboard/intel/kunimitsu/acpi/ec.asl
+++ b/src/mainboard/intel/kunimitsu/acpi/ec.asl
@@ -21,6 +21,9 @@
 #include "../ec.h"
 #include "../gpio.h"
 
+/* Enable EC backed ALS device in ACPI */
+#define EC_ENABLE_ALS_DEVICE
+
 /* Enable EC backed PD MCU device in ACPI */
 #define EC_ENABLE_PD_MCU_DEVICE