diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 77da902..ec00d61 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -23,6 +23,7 @@
 #define CIFS_MOUNT_SERVER_INUM  4 /* inode numbers from uniqueid from server */
 #define CIFS_MOUNT_DIRECT_IO    8 /* do not write nor read through page cache */
 #define CIFS_MOUNT_NO_XATTR  0x10 /* if set - disable xattr support */
+#define CIFS_MOUNT_MAP_SPECIAL_CHR 0x20 /* remap illegal chars in filenames */
 
 struct cifs_sb_info {
 	struct cifsTconInfo *tcon;	/* primary mount */