diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index d374b29..3750431 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -36,8 +36,11 @@
 #include <linux/pagevec.h>
 #include <linux/timer.h>
 #include <linux/sched/rt.h>
+#include <linux/mm_inline.h>
 #include <trace/events/writeback.h>
 
+#include "internal.h"
+
 /*
  * Sleep at most 200ms at a time in balance_dirty_pages().
  */