diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 77253aa..179e6a2 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -90,6 +90,7 @@
 
 extern spinlock_t sysfs_assoc_lock;
 extern struct mutex sysfs_mutex;
+extern struct mutex sysfs_rename_mutex;
 extern struct super_block * sysfs_sb;
 extern const struct file_operations sysfs_dir_operations;
 extern const struct file_operations sysfs_file_operations;