diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c
index b52b738..b6fca54 100644
--- a/fs/hpfs/buffer.c
+++ b/fs/hpfs/buffer.c
@@ -5,7 +5,7 @@
  *
  *  general buffer i/o
  */
-
+#include <linux/sched.h>
 #include "hpfs_fn.h"
 
 void hpfs_lock_creation(struct super_block *s)