diff --git a/src/mainboard/google/chell/Kconfig b/src/mainboard/google/chell/Kconfig
index b2229e5f81..a0704f103d 100644
--- a/src/mainboard/google/chell/Kconfig
+++ b/src/mainboard/google/chell/Kconfig
@@ -24,6 +24,7 @@ config CHROMEOS
 	select CHROMEOS_VBNV_CMOS
 	select EC_SOFTWARE_SYNC
 	select LID_SWITCH
+	select VBOOT_EC_SLOW_UPDATE
 	select VBOOT_OPROM_MATTERS
 	select VIRTUAL_DEV_SWITCH
 
diff --git a/src/mainboard/google/glados/Kconfig b/src/mainboard/google/glados/Kconfig
index 77e1a68986..9bc21fe9a2 100644
--- a/src/mainboard/google/glados/Kconfig
+++ b/src/mainboard/google/glados/Kconfig
@@ -24,6 +24,7 @@ config CHROMEOS
 	select CHROMEOS_VBNV_CMOS
 	select EC_SOFTWARE_SYNC
 	select LID_SWITCH
+	select VBOOT_EC_SLOW_UPDATE
 	select VBOOT_OPROM_MATTERS
 	select VIRTUAL_DEV_SWITCH
 
diff --git a/src/mainboard/google/lars/Kconfig b/src/mainboard/google/lars/Kconfig
index fd6bdd4ea9..673793e367 100644
--- a/src/mainboard/google/lars/Kconfig
+++ b/src/mainboard/google/lars/Kconfig
@@ -24,6 +24,7 @@ config CHROMEOS
 	select CHROMEOS_RAMOOPS_DYNAMIC
 	select CHROMEOS_VBNV_CMOS
 	select LID_SWITCH
+	select VBOOT_EC_SLOW_UPDATE
 	select VBOOT_OPROM_MATTERS
 	select VIRTUAL_DEV_SWITCH
 	select EC_SOFTWARE_SYNC
diff --git a/src/mainboard/intel/kunimitsu/Kconfig b/src/mainboard/intel/kunimitsu/Kconfig
index f30fa52dc2..e392cf3f7b 100644
--- a/src/mainboard/intel/kunimitsu/Kconfig
+++ b/src/mainboard/intel/kunimitsu/Kconfig
@@ -23,6 +23,7 @@ config CHROMEOS
 	select CHROMEOS_RAMOOPS_DYNAMIC
 	select CHROMEOS_VBNV_CMOS
 	select LID_SWITCH
+	select VBOOT_EC_SLOW_UPDATE
 	select VBOOT_OPROM_MATTERS
 	select VIRTUAL_DEV_SWITCH
 	select EC_SOFTWARE_SYNC