diff --git a/src/mainboard/google/guybrush/chromeos.fmd b/src/mainboard/google/guybrush/chromeos.fmd
index be43e8a02d..38757003a7 100644
--- a/src/mainboard/google/guybrush/chromeos.fmd
+++ b/src/mainboard/google/guybrush/chromeos.fmd
@@ -25,7 +25,7 @@ FLASH@0xFF000000 16M {
 			RO_SECTION {
 				FMAP 2K
 				RO_FRID 64
-				GBB@4K 448K
+				GBB@4K 12K
 				COREBOOT(CBFS)
 			}
 		}
diff --git a/src/mainboard/google/mancomb/chromeos.fmd b/src/mainboard/google/mancomb/chromeos.fmd
index be43e8a02d..38757003a7 100644
--- a/src/mainboard/google/mancomb/chromeos.fmd
+++ b/src/mainboard/google/mancomb/chromeos.fmd
@@ -25,7 +25,7 @@ FLASH@0xFF000000 16M {
 			RO_SECTION {
 				FMAP 2K
 				RO_FRID 64
-				GBB@4K 448K
+				GBB@4K 12K
 				COREBOOT(CBFS)
 			}
 		}