diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0a3ea52..e26de6805 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1296,6 +1296,7 @@
 	struct file_system_type * next;
 	struct list_head fs_supers;
 	struct lock_class_key s_lock_key;
+	struct lock_class_key s_umount_key;
 };
 
 extern int get_sb_bdev(struct file_system_type *fs_type,