diff --git a/src/mainboard/lenovo/t400/dsdt.asl b/src/mainboard/lenovo/t400/dsdt.asl
index 6ca09dffb0..a1325fb27a 100644
--- a/src/mainboard/lenovo/t400/dsdt.asl
+++ b/src/mainboard/lenovo/t400/dsdt.asl
@@ -43,4 +43,6 @@ DefinitionBlock(
 
 	/* Dock support code */
 	#include "acpi/dock.asl"
+
+	#include <ec/lenovo/h8/acpi/thinklight.asl>
 }