diff --git a/mm/memory.c b/mm/memory.c
index aede2ce..e8f63d9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -56,6 +56,7 @@
 #include <linux/swapops.h>
 #include <linux/elf.h>
 
+#include <asm/io.h>
 #include <asm/pgalloc.h>
 #include <asm/uaccess.h>
 #include <asm/tlb.h>