diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 8e89d34..2d3d4ed 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -104,6 +104,7 @@
 /* symbol.c */
 void sym_init(void);
 void sym_clear_all_valid(void);
+void sym_set_all_changed(void);
 void sym_set_changed(struct symbol *sym);
 struct symbol *sym_check_deps(struct symbol *sym);
 struct property *prop_alloc(enum prop_type type, struct symbol *sym);