diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index 4185934..97e6fb0 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -21,6 +21,7 @@
  */
 
 #include <linux/buffer_head.h>
+#include <linux/swap.h>
 
 #include "attrib.h"
 #include "debug.h"