diff --git a/mm/highmem.c b/mm/highmem.c
index 0206e7e..51e1c19 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -47,7 +47,8 @@
 	unsigned int pages = 0;
 
 	for_each_online_pgdat(pgdat)
-		pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages;
+		pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
+			NR_FREE_PAGES);
 
 	return pages;
 }