diff --git a/backup/types.go b/backup/types.go
index f12d7855..cc708577 100644
--- a/backup/types.go
+++ b/backup/types.go
@@ -3,7 +3,8 @@ package backup
 type LonghornBackupMode string
 
 const (
-	LonghornBackupParameterBackupMode = "backup-mode"
+	LonghornBackupParameterBackupMode      = "backup-mode"
+	LonghornBackupParameterBackupBlockSize = "backup-block-size"
 
 	LonghornBackupModeFull        = LonghornBackupMode("full")
 	LonghornBackupModeIncremental = LonghornBackupMode("incremental")