diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 3f10307..c357f27 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -163,6 +163,7 @@
 	wait_queue_head_t wb_waitq;
 
 	struct device *dev;
+	struct device *owner;
 
 	struct timer_list laptop_mode_wb_timer;