diff --git a/arch/x86/include/asm/olpc_ofw.h b/arch/x86/include/asm/olpc_ofw.h
index 3e63d857c48f..08fde475cb3b 100644
--- a/arch/x86/include/asm/olpc_ofw.h
+++ b/arch/x86/include/asm/olpc_ofw.h
@@ -12,7 +12,7 @@
 #define olpc_ofw(name, args, res) \
 	__olpc_ofw((name), ARRAY_SIZE(args), args, ARRAY_SIZE(res), res)
 
-extern int __olpc_ofw(const char *name, int nr_args, void **args, int nr_res,
+extern int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
 		void **res);
 
 /* determine whether OFW is available and lives in the proper memory */
diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c
index f5ff3903b38b..0e0cdde519be 100644
--- a/arch/x86/kernel/olpc.c
+++ b/arch/x86/kernel/olpc.c
@@ -188,7 +188,7 @@ static void __init platform_detect(void)
 {
 	size_t propsize;
 	__be32 rev;
-	void *args[] = { NULL, "board-revision-int", &rev, (void *)4 };
+	const void *args[] = { NULL, "board-revision-int", &rev, (void *)4 };
 	void *res[] = { &propsize };
 
 	if (olpc_ofw("getprop", args, res) || propsize != 4) {
diff --git a/arch/x86/kernel/olpc_ofw.c b/arch/x86/kernel/olpc_ofw.c
index f5d499fbe74f..3218aa71ab5e 100644
--- a/arch/x86/kernel/olpc_ofw.c
+++ b/arch/x86/kernel/olpc_ofw.c
@@ -40,7 +40,7 @@ void __init setup_olpc_ofw_pgd(void)
 	early_iounmap(base, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
 }
 
-int __olpc_ofw(const char *name, int nr_args, void **args, int nr_res,
+int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
 		void **res)
 {
 	int ofw_args[MAXARGS + 3];