diff --git a/include/asm-x86/io.h b/include/asm-x86/io.h
index 5a58b17..6fa150f 100644
--- a/include/asm-x86/io.h
+++ b/include/asm-x86/io.h
@@ -3,3 +3,6 @@
 #else
 # include "io_64.h"
 #endif
+extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
+				unsigned long prot_val);
+