diff --git a/src/mainboard/google/guybrush/chromeos.fmd b/src/mainboard/google/guybrush/chromeos.fmd
index 922ed6f4c8..8eaf5e9aec 100644
--- a/src/mainboard/google/guybrush/chromeos.fmd
+++ b/src/mainboard/google/guybrush/chromeos.fmd
@@ -18,7 +18,7 @@ FLASH 16M {
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE)@0x620000 256K
+		SMMSTORE(PRESERVE)@0x620000 512K
 		RW_LEGACY(CBFS)
 		WP_RO@8M 8M {
 			RO_VPD(PRESERVE) 16K