diff --git a/Makefile b/Makefile
index 29597c8..5ed6933 100644
--- a/Makefile
+++ b/Makefile
@@ -29,13 +29,15 @@
 KCONFIG_SPLITCONFIG := $(obj)/config/
 KCONFIG_TRISTATE := $(obj)/tristate.conf
 KCONFIG_NEGATIVES := 1
-KCONFIG_STRICT := 1
+KCONFIG_WERROR:= 1
+KCONFIG_WARN_UNKNOWN_SYMBOLS:= 1
 KCONFIG_PACKAGE := CB.Config
 KCONFIG_MAKEFILE_REAL ?= $(objk)/Makefile.real
 
 COREBOOT_EXPORTS += KCONFIG_CONFIG KCONFIG_AUTOHEADER KCONFIG_AUTOCONFIG
 COREBOOT_EXPORTS += KCONFIG_DEPENDENCIES KCONFIG_SPLITCONFIG KCONFIG_TRISTATE
-COREBOOT_EXPORTS += KCONFIG_NEGATIVES KCONFIG_STRICT
+COREBOOT_EXPORTS += KCONFIG_NEGATIVES KCONFIG_WERROR
+COREBOOT_EXPORTS += KCONFIG_WARN_UNKNOWN_SYMBOLS
 COREBOOT_EXPORTS += KCONFIG_AUTOADS KCONFIG_PACKAGE
 
 # Make does not offer a recursive wildcard function, so here's one: