diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 488b708..9fdcc79 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -30,6 +30,7 @@
 #include <linux/sysctl.h>
 #include <linux/cpu.h>
 #include <linux/syscalls.h>
+#include <linux/buffer_head.h>
 
 /*
  * The maximum number of pages to writeout in a single bdflush/kupdate