diff --git a/src/mainboard/google/butterfly/cmos.layout b/src/mainboard/google/butterfly/cmos.layout
index afdd3c66ca..05de624705 100644
--- a/src/mainboard/google/butterfly/cmos.layout
+++ b/src/mainboard/google/butterfly/cmos.layout
@@ -95,6 +95,7 @@ entries
 # SandyBridge MRC Scrambler Seed values
 896         32        r       0        mrc_scrambler_seed
 928         32        r       0        mrc_scrambler_seed_s3
+960         16        r       0        mrc_scrambler_seed_chk
 
 # coreboot config options: check sums
 984         16       h       0        check_sum