diff --git a/src/ec/lenovo/h8/acpi/ec.asl b/src/ec/lenovo/h8/acpi/ec.asl
index b8350ad680..ed62afeb0f 100644
--- a/src/ec/lenovo/h8/acpi/ec.asl
+++ b/src/ec/lenovo/h8/acpi/ec.asl
@@ -363,7 +363,7 @@ Device(EC)
 		/* Report tablet mode switch state */
 		Method (MHKG, 0, NotSerialized)
 		{
-			Return (TBSW << 3)
+			Return (ShiftLeft(TBSW, 3))
 		}
 		/* Mute audio */
 		Method (SSMS, 1, NotSerialized)