diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index 5339040ef86e7aee7b6457ffd50a390597336104..aca52b83e31dab48ae1cab7acc6b149258b4da03 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -12,7 +12,8 @@
  * Very basic string functions
  */
 
-#include "boot.h"
+#include <linux/types.h>
+#include "ctype.h"
 
 /*
  * This file gets included in compressed/string.c which might pull in