diff --git a/upgradedb.go b/upgradedb.go
index f9d8165..268bc06 100644
--- a/upgradedb.go
+++ b/upgradedb.go
@@ -269,7 +269,10 @@ func upgradedb() {
 		doordie(db, "update config set value = 24 where key = 'dbversion'")
 		fallthrough
 	case 24:
-
+		doordie(db, "update honks set convoy = 'missing-' || abs(random() % 987654321) where convoy = ''")
+		doordie(db, "update config set value = 25 where key = 'dbversion'")
+		fallthrough
+	case 25:
 	default:
 		log.Fatalf("can't upgrade unknown version %d", dbversion)
 	}
diff --git a/util.go b/util.go
index feed1d0..b140706 100644
--- a/util.go
+++ b/util.go
@@ -74,7 +74,7 @@ var alreadyopendb *sql.DB
 var dbname = "honk.db"
 var blobdbname = "blob.db"
 var stmtConfig *sql.Stmt
-var myVersion = 24
+var myVersion = 25
 
 func initdb() {
 	schema, err := ioutil.ReadFile("schema.sql")