diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 885cc97..e9d8069 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -55,6 +55,7 @@
 	NR_PAGETABLE,	/* used for pagetables */
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
+	NR_UNSTABLE_NFS,	/* NFS unstable pages */
 	NR_VM_ZONE_STAT_ITEMS };
 
 struct per_cpu_pages {