diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 80eb0d31d0d3..254ce2b90158 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -20,6 +20,7 @@
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
+#include <asm/io.h>
 
 #include <linux/hugetlb.h>
 #include "internal.h"