diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index e5ad107..892643d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -465,7 +465,7 @@
 		.range_end	= LLONG_MAX,
 	};
 	unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
-	unsigned long nr_unstable = read_page_state(nr_unstable);
+	unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
 
 	wbc.nr_to_write = nr_dirty + nr_unstable +
 			(inodes_stat.nr_inodes - inodes_stat.nr_unused) +