diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 4e414b06192e..27ec6c537d95 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1889,7 +1889,7 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
 	struct wc_memory_superblock s;
 
 	static struct dm_arg _args[] = {
-		{0, 10, "Invalid number of feature args"},
+		{0, 16, "Invalid number of feature args"},
 	};
 
 	as.argc = argc;