diff --git a/controllers/adminController.go b/controllers/adminController.go
index ed32b1e..3e3b334 100644
--- a/controllers/adminController.go
+++ b/controllers/adminController.go
@@ -1843,6 +1843,11 @@ func UpdateMiler(c *fiber.Ctx) error {
 		Displayname        string `json:"displayname"`
 		Defaultvehicletype string `json:"defaultvehicletype"`
 		Hubid              *int   `json:"hubid"`
+		// Legacyuserid links this rider to their old jupiter userid, so telemetry
+		// still arriving over the jupiter NATS chain resolves to them. Writable
+		// here because there is no other way to set it — the column is populated
+		// by ops for migrated riders, never by the rider themselves.
+		Legacyuserid *int `json:"legacyuserid"`
 	}
 
 	req := new(MilerUpdate)
@@ -1859,6 +1864,9 @@ func UpdateMiler(c *fiber.Ctx) error {
 	if req.Hubid != nil {
 		profile.Hubid = req.Hubid
 	}
+	if req.Legacyuserid != nil {
+		profile.Legacyuserid = req.Legacyuserid
+	}
 	profile.Updatedat = time.Now()
 
 	if err := db.DB.Save(profile).Error; err != nil {