diff --git a/flash.h b/flash.h
index 0a74363..9180583 100644
--- a/flash.h
+++ b/flash.h
@@ -385,6 +385,7 @@
 #if INTERNAL_SUPPORT == 1
 extern int is_laptop;
 extern int force_boardenable;
+extern int force_boardmismatch;
 void probe_superio(void);
 int internal_init(void);
 int internal_shutdown(void);