diff --git a/arch/powerpc/boot/io.h b/arch/powerpc/boot/io.h
index 7c09f4861fe18b32eba553dc3a72679726142f7b..394da5500466ff7f9a4cfcd183398fccc7d9a28b 100644
--- a/arch/powerpc/boot/io.h
+++ b/arch/powerpc/boot/io.h
@@ -1,5 +1,5 @@
 #ifndef _IO_H
-#define __IO_H
+#define _IO_H
 
 #include "types.h"