diff --git a/include/linux/fs.h b/include/linux/fs.h
index 860689f..02a9fb5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1685,6 +1685,7 @@
 
 /* fs/block_dev.c */
 #define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
+#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
 
 #ifdef CONFIG_BLOCK
 #define BLKDEV_MAJOR_HASH_SIZE	255