diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 839e9a0..67e03fc 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -51,6 +51,7 @@
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
 			   only modified from process context */
 	NR_FILE_PAGES,
+	NR_SLAB,	/* Pages used by slab allocator */
 	NR_VM_ZONE_STAT_ITEMS };
 
 struct per_cpu_pages {