diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 7577a7f..f8aee5f 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -122,6 +122,8 @@
 /* util.c */
 struct file *file_lookup(const char *name);
 int file_write_dep(const char *name);
+void *xmalloc(size_t size);
+void *xcalloc(size_t nmemb, size_t size);
 
 struct gstr {
 	size_t len;