diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index e5255a251929afb4aab4aa4be975c4e3a23fc31c..79047cd54611719b1337300f9367bce7aa22964a 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -334,7 +334,7 @@ struct mft_inode {
 
 /* Nested class for ntfs_inode::ni_lock. */
 enum ntfs_inode_mutex_lock_class {
-	NTFS_INODE_MUTEX_DIRTY,
+	NTFS_INODE_MUTEX_DIRTY = 1,
 	NTFS_INODE_MUTEX_SECURITY,
 	NTFS_INODE_MUTEX_OBJID,
 	NTFS_INODE_MUTEX_REPARSE,