diff --git a/doc/high-availability-guide/ap-mysql.txt b/doc/high-availability-guide/ap-mysql.txt
index 05b1cdadbf..658950c4f9 100644
--- a/doc/high-availability-guide/ap-mysql.txt
+++ b/doc/high-availability-guide/ap-mysql.txt
@@ -74,7 +74,7 @@ synchronization), you may proceed with creating the filesystem for
 MySQL data. XFS is the generally recommended filesystem:
 
 ----
-mkfs -t xfs /dev/drbd1
+mkfs -t xfs /dev/drbd0
 ----
 
 You may also use the alternate device path for the DRBD device, which